13" Macbookpro, OS 10.14.6 Acrobat Reader opens, asks if I want to make it default pdf software (no), and an ad pops up about installing the Chrome Acrobat plug-in - see attached. It doesn't fully load, and the only way to deal with it is to force-quit Acrobat. I tried opening it from the document also. Same thing.
I uninstalled, and re-installed, and rebooted the computer. Same result.
Sure looks like your ad (if it is your ad) is the problem.