CRX_INSTALL Infection Blocked JS:ShellCode-S [Expl] diff_match_patch.jsÇ

Hi,

Starting yesterday, whenever I open Chrome on my Mac I get the following message.

https://image.ibb.co/hT1exk/diff_match_patch.png

I’ve run a full scan and found a couple of infected files in my Outlook folders. I removed them, rebooted, and still have the same problem. I also ran Malwarebytes Anti-Malware and it did not find any infected files.

How can I tell whether this is an actual infection or a false positive?

One note: the “scoped_dir_” directory in the File list is not there when I look at this directory from a terminal.

Thanks!

Ray