1) Sounds like a problem with the document
2) MalwareBytes IS NOT AN ANTIVIRUS utility. You MUST install an antivirus utility. NOW.
MalwareBytes is a fine adjunct to an antivirus program, but it is not a replacement for one. If you want a free program get Avast, Avira or AVG. If you are willing to pay you have a LOT of choice. My personal favorite is Kaspersky Anti Virus. Regardless, get one NOW, install it, update it, and run a FULL SCAN of your system. NOW.