One of my users opened an attachment that was sent from someone she knows, but has confirmed the email account was compromised. The attachment was called Seminar Invitation.pdf, and was password protected.
AV scans of the file show no threats, and virustotal.com doesn't come up with anything either.
What are the chances of this being a virus? I've been googling it and haven't found much info on viruses being spread via password protected PDF files.