• MEENAL JOSHI
• SUMIT PATIDAR
• ANMOL SINGH GANGWAR
• RAJENDRA

Security vulnerabilities are one of the main reasons behind many cybersecurity incidents today. To catch these bugs before attackers do, techniques like fuzzing have become really popular. Tools like AFL have massively improved how we find hidden issues in software. While open-source software is everywhere—servers, browsers, even PDF readers—just being open doesn't automatically make it secure. Sumatra PDF is a lightweight, fast, and open-source alternative to bulky readers like Adobe Acrobat, but it’s still software and still has bugs. In this project, I wanted to test how secure it really is. I used fuzzing tools like AFL++ and WinAFL to throw malformed PDF files at Sumatra PDF and observed how it reacted. The results? Multiple crashes, some memory corruption, and a few bugs that could definitely be dangerous. This paper walks through how I set everything up, what I found, and why we need better security testing—even in small open-source tools.

Fuzzing/Fuzz Testing, Sumatra PDF Reader, WinAFL, Crash Analysis

"IMPROVING OPEN-SOURCE PDF READER SECURITY USING FUZZING ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.12, Issue 6, page no.309-312, June-2025, Available :http://www.jetir.org/papers/JETIRGW06050.pdf

"IMPROVING OPEN-SOURCE PDF READER SECURITY USING FUZZING ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.12, Issue 6, page no. pp309-312, June-2025, Available at : http://www.jetir.org/papers/JETIRGW06050.pdf