The PDF functionality in Google Chrome before 24.0.1312.52 does not properly perform a cast of an unspecified variable during processing of the root of the structure tree, which allows remote attackers to cause a denial of service or possibly have unknown other impact via a crafted document.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16272
https://code.google.com/p/chromium/issues/detail?id=162153
http://googlechromereleases.blogspot.com/2013/01/stable-channel-update.html