The PDF functionality in Google Chrome before 22.0.1229.79 allows remote attackers to cause a denial of service or possibly have unspecified other impact via vectors that trigger out-of-bounds write operations.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A15773
https://code.google.com/p/chromium/issues/detail?id=146460
https://code.google.com/p/chromium/issues/detail?id=145157
https://code.google.com/p/chromium/issues/detail?id=145029
http://googlechromereleases.blogspot.com/2012/09/stable-channel-update_25.html