FWIW Clams SIGS don't show it as a virus so that sums up why it didnt get caught.
https://www.virustotal.com/en/file/fd996a992eea0ac33e842391dd083759461455bad3dfc6fb8e8586bf0666aa62/analysis/
I'm holding out for v14 to fix the issues with ClamAV before pushing up but I'm wonder if ClamSUP would have caught this?