Netskope Threat Labs

FILE-PDF Adobe Reader malformed JPEG2000 image invalid colr size out of bounds read attempt

IPS-SWG

1 SID: 46732

First seen
January 2022
Last seen
October 2026

Detects a PDF exploiting CVE-2018-4985, an out-of-bounds read in Adobe Reader's JPEG2000 decoding that can leak memory. The rule matches the crafted color channel boxes that public exploits use to read beyond allocated buffers.