PDF files are notorious to have nasty viruses and I suspect that this is a caution that "Attachments downloaded from the internet may contain viruses" -- noting the operative word ' may contain' as opposed to 'does contain'. There was an update in Outlook that kicks in this extremely cautious mode. You can see that via a Google search. Did they test it? Save the attachment and let ESET scan it. If it has one, it was created either at the source, or at the destination and should be dealt with there; or it's a false alarm. Timeslips doesn't create viruses and merely packages up a PDF version of the bill, and sends it to the installed email client to deliver it.
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