ClamAV before 0.100.1 has an HWP integer overflow with a resultant infinite loop via a crafted Hangul Word Processor file. This is in parsehwp3_paragraph() in libclamav/hwp.c.
https://usn.ubuntu.com/3722-2/
https://usn.ubuntu.com/3722-1/
https://security.gentoo.org/glsa/201904-12
https://secuniaresearch.flexerasoftware.com/secunia_research/2018-12/
https://lists.debian.org/debian-lts-announce/2018/08/msg00020.html
https://blog.clamav.net/2018/07/clamav-01001-has-been-released.html