Why am I getting Google Drive notifications about strangers' documents? Screenshot:

Is this just a new form of spam or phishing technique, basically betting that I'll click on the notification and look at the document? I haven't looked at any of them yet, but it seems utterly bizarre that Google Drive would notify me of the occurrence of anything in someone else's document.
A quick tour of the Russian alphabet and Google Translate reveals the document name as &quot;Message No. FB-24&quot;.
Cross-post
This has happened to me more then once and always on a chromebook. (I don't own one anymore) Anyway I just wanted to say something because it was malware in my case.