The PDF parser in Google Chrome before 16.0.912.63 allows remote attackers to cause a denial of service (out-of-bounds read) via unspecified vectors.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A14548
http://googlechromereleases.blogspot.com/2011/12/stable-channel-update.html