peepdf is a Python tool to explore PDF files in order to find out if the file can be harmful or not. The aim of this tool is to provide all the necessary components that a security researcher could need in a PDF analysis without using 3 or 4 tools to make all the tasks. With peepdf it's possible to see all the objects in the document showing the suspicious elements, supports all the most used filters and encodings, it can parse different versions of a file, object streams and encrypted files. With the installation of PyV8 and Pylibemu it provides Javascript and shellcode analysis wrappers too. Apart of this it's able to create new PDF files and to modify/obfuscate existent ones.
The main functionalities of peepdf are the following:
Installation: Here's what I did to make the extra libraries work
- Note: This installs peepdf system wide.
- This repo:
git clone https://github.com/harakan/peepdf
cd peepdf && sudo python3 setup.py install - Infamous PyV8 Library. This uses the new stpyv8 fork:
git clone [email protected]:area1/stpyv8.git
sudo bash install-ubuntu.sh
sudo python3 setup.py install - Install the libemu:
pip3 install pylibemu
... and hopefully that works!
Analysis:
- Decodings: hexadecimal, octal, name objects
- More used filters
- References in objects and where an object is referenced
- Strings search (including streams)
- Physical structure (offsets)
- Logical tree structure
- Metadata
- Modifications between versions (changelog)
- Compressed objects (object streams)
- Analysis and modification of Javascript (PyV8): unescape, replace, join
- Shellcode analysis (Libemu python wrapper, pylibemu)
- Variables (set command)
- Extraction of old versions of the document
- Easy extraction of objects, Javascript code, shellcodes (>, >>,
$>, $ >>) - Checking hashes on VirusTotal
Creation/Modification:
- Basic PDF creation
- Creation of PDF with Javascript executed wen the document is opened
- Creation of object streams to compress objects
- Embedded PDFs
- Strings and names obfuscation
- Malformed PDF output: without endobj, garbage in the header, bad header...
- Filters modification
- Objects modification
Execution modes:
- Simple command line execution
- Powerful interactive console (colorized or not)
- Batch mode
TODO:
- Embedded PDFs analysis
- Improving automatic Javascript analysis
- GUI
Related articles:
- Spammed CVE-2013-2729 PDF exploit dropping ZeuS-P2P/Gameover
- New peepdf v0.2 (Version Black Hat Vegas 2012)
- peepdf supports CCITTFaxDecode encoded streams
- Explanation of the changelog of peepdf for Black Hat Europe Arsenal 2012
- How to extract streams and shellcodes from a PDF, the easy way
- Static analysis of a CVE-2011-2462 PDF exploit
- Analysis of a malicious PDF from a SEO Sploit Pack
- Analysing the Honeynet Project challenge PDF file with peepdf Part 1 Part 2
- Analyzing Suspicious PDF Files With Peepdf
Included in:
You are free to contribute with feedback, bugs, patches, etc. Any help is welcome. Also, if you really enjoy using peepdf, you think it is worth it and you feel really generous today you can donate some bucks to the project ;) Thanks!
