Acrobat tries to open mysterious file that I didn't open
Every now and then, I'll get a pop up that says Acrobat DC can't open the file because it is not a pdf. Only, it happens when I wasn't trying to open a file at all! I haven't noticed a pattern of when it happens and it doesn't seem to be related to any specific action I'm taking. Sometimes it happens when I'm reading a pdf, other times it happens when I'm working in a totally unrelated app, checking email, or web browsing.
This has happened 4 times over the last few months. It will pop up, and then not happen again for 3 weeks or so.
Has anyone experienced this? Could malware or a virus be trying to open something and my comp thinks it should try Acrobat? Seems a little suspicious.
Macbook Pro Mid 2012 (yeah, I know), Mojave 10.14.6
I don't remember the specific last update.
