o_O
My NAS inbuilt AV scanner (ClamAV) lit up this morning with a bunch of TIFFs.
I suspect false positives, as these are TIFFs which (in two cases) have been sat idle for a few years and last touched as part of an archive/backup.
Jotti and VirusTotal also only showed ClamAV reporting those files with the 'issue', so if you are running ClamAV, I'd consider a pinch of salt with your virus scan reports this morning....