Peepdf: A Complete Guide to Analyzing PDF Files for Security Threats

PDFs are common but can contain hidden threats. Peepdf is a Python tool that helps analysts inspect and analyze them for security risks. This blog will provide a complete, beginner-friendly guide on Peepdf, including its installation, features, and step-by-step usage.

What is Peepdf?

Peepdf is an open-source Python tool for analyzing PDFs, detecting malicious code, and extracting embedded content. It is widely used in cybersecurity and forensic research.

Key Features:

• Parses PDF structure and metadata.
• Detects JavaScript, embedded files, and exploits.
• Extracts and analyzes suspicious content.
• Supports command-line interaction for deep analysis.

How to Install Peepdf?

Peepdf comes pre-installed in Kali Linux, but if you need to install it manually, follow these steps:

1. Installation on Kali Linux (If Not Installed)

sudo apt update
sudo apt install peepdf

2. Installation on Other Systems

git clone https://github.com/jesparza/peepdf.git
cd peepdf
pip install -r requirements.txt
python peepdf.py -h

How to Use Peepdf for PDF Analysis

1. Basic PDF Analysis

python peepdf.py <filename.pdf>

Example:

python peepdf.py malicious.pdf

Displays the file’s structure and highlights potential threats.

2. Extracting Metadata

python peepdf.py malicious.pdf -i
info

Reveals details like author, creation date, and modifications.

3. Detecting JavaScript and Embedded Code

js

Lists JavaScript objects found in the PDF.

4. Extracting Suspicious Files

objects
dump <object_number> output_file

For example:

dump 10 extracted_file.js

5. Checking for Obfuscation and Encryption

encryption

Detects encryption and obfuscation techniques used in the PDF.

Conclusion

Peepdf is a powerful tool for analyzing suspicious PDFs, detecting hidden threats, and extracting malicious content. Whether you’re dealing with phishing emails or malware-laden documents, Peepdf provides deep insight into potential dangers.