Example (dictionary attack):
pdfcrack.exe -w common.txt -o found.txt protected.pdf Example (brute-force, 6 digits only): pdfcrack.exe
Report ID: SEC-FOR-2026-04 Date: April 18, 2026 Author: Digital Forensics & Security Analysis Unit Subject: Examination of pdfcrack.exe – Functionality, Performance, and Security Implications 1. Executive Summary pdfcrack.exe is a portable, command-line password recovery tool specifically designed to break encrypted PDF files. It targets user and owner passwords by employing dictionary attacks, brute-force attacks, or hybrid methods. The tool is open-source (originally from SourceForge) and widely used in digital forensics, legacy data recovery, and security testing. This report provides an in-depth technical review of its operational principles, attack modes, performance benchmarks, and inherent limitations. 2. Introduction PDF encryption is based on several algorithms, including RC4 (40-bit and 128-bit) and AES (128-bit and 256-bit). When a user forgets a PDF password, or when access is needed for forensic analysis, tools like pdfcrack attempt to recover the password without exploiting cryptographic weaknesses—instead, they perform brute-force or dictionary guessing. Example (dictionary attack): pdfcrack