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In this tutorial, Jens Miller, a PhD candidate at the University of Bohol, discusses methods to break PDF encryption, focusing on their research collaboration with the University of Applied Sciences in Munster. The research, referred to as PDF acceleration or PDFx, unveils two novel attacks highlighting weaknesses in the PDF encryption standard. The first attack, named "direct exfiltration," exploits flaws in the PDF data format structure that permit partial encryption. The second attack, "mobility gadgets," targets vulnerabilities in U.S. block cipher modes of operation. The presentation outlines these attacks in detail, aiming to provide insights into the security shortcomings of PDF encryption.
