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Usage
Digital Sleuth edited this page Dec 30, 2023
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usage: peepdf [options] pdf
Version: peepdf 3.0.0
positional arguments:
pdf PDF File
optional arguments:
-C COMMANDS, --command COMMANDS
Specifies a command from the interactive console to be executed.
-c, --check-vt Checks the hash of the PDF file on VirusTotal.
-f, --force-mode Sets force parsing mode to ignore errors.
-g, --grinch-mode Avoids colorized output.
-h, --help show this help message and exit
-i, --interactive Sets console mode.
-j, --json Shows the document information in JSON format.
-k VTAPIKEY, --key VTAPIKEY
VirusTotal API Key, used with -c/--check-vt
-l, --loose-mode Sets loose parsing mode to catch malformed objects.
-m, --manual-analysis
Avoids automatic Javascript analysis. Useful with eternal loops like heap spraying.
-o, --ocr Extract text from the PDF
-s SCRIPTFILE, --load-script SCRIPTFILE
Loads the commands stored in the specified file and execute them.
-u, --update Fetches updates for the Vulnerability List
-v, --version Shows program's version number.
-x, --xml Shows the document information in XML format.
- Basic execution
- Interactive console
- Script mode
- JSON Output
- XML Output
- VirusTotal analysis
- OCR
All of them accept parameters to ignore errors and continue with the analysis and deal with malformed objects:
-f: ignores errors and continues with the analysis of the document. It's useful to analyze malicious documents, or when documents contain errors in one or more spots which would prevent normal analysis.
-l: does not search for the endobj tag during the parsing process, so it can be useful when the analyzed document is malformed.
-g: avoids colorized output.
-m: avoids performing any automatic Javascript analysis. This can be helpful when the analysis does not end due to a endless loop in the Javascript code.
Before executing peepdf it is recommended to check for an update of the PDF Vulnerability List, just in case there are new vulnerabilities reported. See the next section to know how to do it.
In order to update the PDF Vulnerability List you can just use the -u parameter:
$ peepdf -u
[-] Checking if there are new updates to the Vulnerabilties List
[-] Current Version: 1.0.0
[-] Remote Version: 1.0.1
[+] Update available
[-] Fetching the update ...
[*] File PDFVulns.py exists, overwriting ...
[+] peepdf Vulnerabilities List updated successfully to 1.0.1
If peepdf was installed using sudo privileges, or you do not have permissions to write to the location of PDFVulns.py, then this command may need to be run with sudo privileges.
If we only want to know the basic information about objects, streams, vulnerabilities etc, you can simply run the following against your PDF:
$ peepdf samplesecured_256bitaes_pdf.pdf
File: samplesecured_256bitaes_pdf.pdf
Title: Microsoft Word - Placeholder Documentation.docx
MD5: abd43766905e12704da9411682681f7e
SHA1: 8c6dcc4bafb23eac83db37e187ec5155b6ac7e8f
SHA256: 15f9cd381e3d87f09c9d3d1a53e23b8d4a57559351de7c7db3d7b8bed7acbe72
Size: 21634 bytes
IDs:
Version 0: [ <CC56D8A7F574DE7ED75787D94BF65288> <CC56D8A7F574DE7ED75787D94BF65288> ]
PDF Format Version: 1.7
Binary: True
Linearized: False
Encrypted: True (AES 256 bits)
Updates: 0
Objects: 10
Streams: 7
URIs: 0
Comments: 0
Errors: 0
Version 0:
Catalog: 21
Info: 2
Objects (22): [2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 21, 22, 23, 24]
Compressed objects (12): [3, 4, 13, 8, 9, 17, 10, 11, 19, 12, 7, 6]
Streams (7): [24, 5, 14, 15, 16, 18, 22]
Xref streams (1): [24]
Object streams (1): [22]
Encoded (7): [24, 5, 14, 15, 16, 18, 22]
To access the interactive console, the best way is to provide the PDF as an argument to the -i command at the console:
$ peepdf -i sample.pdf
File: samplesecured_256bitaes_pdf.pdf
Title: Microsoft Word - Placeholder Documentation.docx
MD5: abd43766905e12704da9411682681f7e
SHA1: 8c6dcc4bafb23eac83db37e187ec5155b6ac7e8f
SHA256: 15f9cd381e3d87f09c9d3d1a53e23b8d4a57559351de7c7db3d7b8bed7acbe72
Size: 21634 bytes
IDs:
Version 0: [ <CC56D8A7F574DE7ED75787D94BF65288> <CC56D8A7F574DE7ED75787D94BF65288> ]
PDF Format Version: 1.7
Binary: True
Linearized: False
Encrypted: True (AES 256 bits)
Updates: 0
Objects: 10
Streams: 7
URIs: 0
Comments: 0
Errors: 0
Version 0:
Catalog: 21
Info: 2
Objects (22): [2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 21, 22, 23, 24]
Compressed objects (12): [3, 4, 13, 8, 9, 17, 10, 11, 19, 12, 7, 6]
Streams (7): [24, 5, 14, 15, 16, 18, 22]
Xref streams (1): [24]
Object streams (1): [22]
Encoded (7): [24, 5, 14, 15, 16, 18, 22]
PPDF>
When we see the PPDF> prompt we can launch the different commands:
PPDF> help
Documented commands (type help <topic>):
========================================
bytes exit js_join open set
changelog extract js_unescape quit show
clear filters js_vars rawobject stream
create hash log rawstream streams
decode help malformed_output references tree
decrypt info metadata replace vtcheck
embed js_analyse modify reset xor
encode js_beautify object save xor_search
encode_strings js_code objects save_version
encrypt js_eval ocr sctest
errors js_jjdecode offsets search
It is possible to launch the interactive console without specifying any PDF file:
$ peepdf -i
PPDF>
However, now we cannot use all of the commands until a PDF file has been opened, but we can execute Javascript and shellcodes, encode/decode contents, etc. The available commands will be the following:
clear
create
decode
encode
exit
help
js_analyse
js_beautify
js_eval
js_jjdecode
js_join
js_unescape
js_vars
log
malformed_output
open
quit
replace
reset
sctest
set
show
vtcheck
xor
xor_search
Instead of executing peepdf with an interactive console, it is also possible to execute it in script mode in order to perform automatic analysis. So after creating a file with the commands we want to execute:
$ cat command_file.txt
tree
offsets
We can execute peepdf this way:
$ peepdf -s command_file.txt sample.pdf
/Catalog (21)
/Pages (3)
/Page (4)
stream (5)
Unknown (0)
/Pages (3)
/R7 (12)
/ExtGState (7)
dictionary (13)
/Font (10)
/Encoding (19)
/FontDescriptor (11)
stream (15)
stream (18)
/Font (8)
/Encoding (17)
/FontDescriptor (9)
stream (14)
stream (16)
integer (6)
stream (22)
/R7 (12)
/Page (4)
/FontDescriptor (9)
stream (5)
/ExtGState (7)
stream (14)
/Font (10)
/Pages (3)
/FontDescriptor (11)
/Font (8)
dictionary (13)
stream (16)
/Encoding (19)
stream (15)
/Encoding (17)
stream (18)
/Info (2)
dictionary (23)
stream (24)
/Info (2)
/Catalog (21)
dictionary (23)
Start (d) End (d) Size (d) Type and Id
--------- --------- --------- --------------------
00000000 Header
00000015 00000069 00000055 Object 21
00000061 00000397 00000337 Object 16
00000403 00009140 00008738 Object 14
00009144 00009496 00000353 Object 18
00009502 00019119 00009618 Object 15
00019123 00019794 00000672 Object 5
00019800 00020585 00000786 Object 22
00019820 00019895 00000076 Compressed Object 3
00019864 00020046 00000183 Compressed Object 4
00019999 00020047 00000049 Compressed Object 13
00020023 00020271 00000249 Compressed Object 8
00020228 00020447 00000220 Compressed Object 9
00020401 00020638 00000238 Compressed Object 17
00020584 00020891 00000308 Object 2
00020591 00020853 00000263 Compressed Object 10
00020809 00021033 00000225 Compressed Object 11
00020944 00021288 00000345 Object 23
00020986 00021191 00000206 Compressed Object 19
00021141 00021176 00000036 Compressed Object 12
00021154 00021203 00000050 Compressed Object 7
00021179 00021200 00000022 Compressed Object 6
00021309 00021607 00000299 Object 24
00021609 00021626 00000018 Trailer
00021627 EOF
You can obtain the basic information as provided with the $ peepdf sample.pdf command and obtain it in a JSON output:
$ peepdf -j sampleunsecuredpdf.pdf
{
"peepdf_analysis": {
"advanced": [
{
"version_info": {
"catalog": "1",
"compressed_objects": [],
"decoding_error_streams": [],
"encoded_streams": [
16,
18,
14,
15,
5
],
"error_objects": [],
"info": "2",
"js_objects": [],
"objects": [
1,
2,
3,
4,
5,
6,
7,
8,
9,
10,
11,
12,
13,
14,
15,
16,
17,
18,
19
],
"streams": [
16,
18,
14,
15,
5
],
"suspicious_elements": {
"actions": null,
"elements": [],
"js_vulns": [],
"triggers": null,
"urls": null
},
"version_number": 0,
"version_type": "original",
"xref_streams": []
}
}
],
"basic": {
"binary": true,
"comments": 0,
"detection": {},
"encrypted": true,
"encryption_algorithms": [],
"errors": [],
"filename": "sampleunsecuredpdf.pdf",
"ids": {
"version_0": "[ <CC56D8A7F574DE7ED75787D94BF65288> <CC56D8A7F574DE7ED75787D94BF65288> ]"
},
"linearized": true,
"md5": "514e921f41157625a3036db0e97b0eba",
"num_objects": 19,
"num_streams": 5,
"pdf_version": "1.3",
"sha1": "546bb73b0e26d444a06b30a3e36b22d38184f0e9",
"sha256": "5d47ab196e3b05dcf87d4b37aeda45ae362107026844dda9b2a64a6132c76c59",
"size": 22057,
"updates": 0
},
"date": "2023-12-30 20:07:58",
"peepdf_info": {
"author": "Jose Miguel Esparza and Corey Forman",
"url": "https://github.com/digitalsleuth/peepdf-3",
"version": "3.0.0"
}
}
Additionally, it's possible to obtain the same information provided in the basic execution in XML format thanks to the -x option (combined with -fl if needed). The associated DTD can be found at the root of the repo.
$ peepdf -x 517fe6ba9417e6c8b4d0a0b3b9c4c9a9
<peepdf_analysis version="3.0.0" url="https://github.com/digitalsleuth/peepdf-3" author="Jose Miguel Esparza and Corey Forman">
<date>2023-12-30 20:04:44</date>
<basic>
<filename>517fe6ba9417e6c8b4d0a0b3b9c4c9a9</filename>
<md5>2f7cec0f91a5fd23d706dc53a82b2db7</md5>
<sha1>162e98d89f2ae3b4b469b066ebfe02af22e9b869</sha1>
<sha256>576a373ccb9b62c3c934abfe1573a87759a2bfe266477155e0e59f336cc28ab4</sha256>
<size>2333</size>
<id0>Version 0: [ <de4e269db5990d50542c77c1afd6874e> <de4e269db5990d50542c77c1afd6874e> ]</id0>
<detection/>
<pdf_version>1.4</pdf_version>
<binary status="true"/>
<linearized status="false"/>
<encrypted status="false"/>
<updates>0</updates>
<num_objects>13</num_objects>
<num_streams>3</num_streams>
<comments>0</comments>
<errors num="0"/>
</basic>
<advanced>
<version num="0" type="original">
<catalog object_id="12"/>
<info object_id="13"/>
<objects num="13">
<object id="1" errors="false"/>
<object id="2" errors="false"/>
<object id="3" errors="false"/>
<object id="4" errors="false"/>
<object id="5" errors="false"/>
<object id="6" errors="false"/>
<object id="7" errors="false"/>
<object id="8" errors="false"/>
<object id="9" errors="false"/>
<object id="10" errors="false"/>
<object id="11" errors="false"/>
<object id="12" errors="true"/>
<object id="13" errors="false"/>
</objects>
<streams num="3">
<stream id="1" encoded="true"/>
<stream id="3" encoded="true"/>
<stream id="6" encoded="true"/>
</streams>
<js_objects>
<container_object id="3"/>
<container_object id="12"/>
</js_objects>
<suspicious_elements>
<triggers>
<trigger name="/Names">
<container_object id="9"/>
<container_object id="10"/>
<container_object id="12"/>
</trigger>
<trigger name="/OpenAction">
<container_object id="12"/>
</trigger>
</triggers>
<actions>
<action name="/JS">
<container_object id="4"/>
<container_object id="12"/>
</action>
<action name="/JavaScript">
<container_object id="4"/>
<container_object id="11"/>
<container_object id="12"/>
</action>
</actions>
<elements>
<element name="/EmbeddedFile">
<container_object id="1"/>
</element>
<element name="/EmbeddedFiles">
<container_object id="11"/>
</element>
</elements>
<js_vulns>
<vulnerable_function name=".SettingContent">
<cve>CVE-2018-8414</cve>
<container_object id="3"/>
</vulnerable_function>
</js_vulns>
</suspicious_elements>
<suspicious_urls/>
</version>
</advanced>
</peepdf_analysis>
You can check VirusTotal for any hits on this file with the -c and -k commands, unless you have your API manually added to the main.py file under the VT_KEY variable.
peepdf -c -k <api_key> <filename>
File: 517fe6ba9417e6c8b4d0a0b3b9c4c9a9
MD5: 2f7cec0f91a5fd23d706dc53a82b2db7
SHA1: 162e98d89f2ae3b4b469b066ebfe02af22e9b869
SHA256: 576a373ccb9b62c3c934abfe1573a87759a2bfe266477155e0e59f336cc28ab4
Size: 2333 bytes
IDs:
Version 0: [ <de4e269db5990d50542c77c1afd6874e> <de4e269db5990d50542c77c1afd6874e> ]
Detection: 40/60
Detection report: https://www.virustotal.com/gui/file/576a373ccb9b62c3c934abfe1573a87759a2bfe266477155e0e59f336cc28ab4
PDF Format Version: 1.4
Binary: True
Linearized: False
Encrypted: False
Updates: 0
Objects: 13
Streams: 3
URIs: 0
Comments: 0
Errors: 0
Version 0:
Catalog: 12
Info: 13
Objects (13): [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13]
Streams (3): [1, 3, 6]
Encoded (3): [1, 3, 6]
Objects with JS code (2): [3, 12]
Suspicious elements (12):
/Names (3): [9, 10, 12]
/OpenAction (1): [12]
/JS (2): [4, 12]
/JavaScript (3): [4, 11, 12]
.SettingContent (CVE-2018-8414) (1): [3]
/EmbeddedFile (1): [1]
/EmbeddedFiles (1): [11]
This option simply extracts any legible text from the PDF document, in the event that it can't be opened and contains pertinent data:
$ peepdf -o phishing_email.pdf
I have shared an attachment with you using via Pdf.
Sign in here with your email to view complete document .
Thanks