PDFium in Google Chrome prior to 57.0.2987.98 for Windows could be made to increment off the end of a buffer, which allowed a remote attacker to potentially exploit heap corruption via a crafted PDF file.
https://security.gentoo.org/glsa/201704-02
https://chromereleases.googleblog.com/2017/03/stable-channel-update-for-desktop.html
http://www.securityfocus.com/bid/96767