Type confusion in PDFium in Google Chrome prior to 60.0.3112.78 for Mac, Windows, Linux, and Android allowed a remote attacker to potentially maliciously modify objects via a crafted PDF file.
https://security.gentoo.org/glsa/201709-15
https://chromereleases.googleblog.com/2017/07/stable-channel-update-for-desktop.html
https://access.redhat.com/errata/RHSA-2017:1833