An issue was discovered in pdfcrack 0.17 thru 0.18, allows attackers to execute arbitrary code via a stack overflow in the MD5 function.
https://sourceforge.net/p/pdfcrack/bugs/12/
https://lists.debian.org/debian-lts-announce/2023/08/msg00004.html
https://lists.debian.org/debian-lts-announce/2023/08/msg00004.html