Use-after-free vulnerability in PDFium, as used in Google Chrome before 39.0.2171.65, allows remote attackers to cause a denial of service or possibly have unspecified other impact via a crafted PDF document.
http://googlechromereleases.blogspot.com/2014/11/stable-channel-update_18.html
https://code.google.com/p/chromium/issues/detail?id=414504