Hi,
Just a quick update for you, we are currently looking into this issue at a top priority on both client and server side, we hope to have this fixed as soon as possible. I have tested this with the files you and other users provided and I am able to see the issue so the message you are seeing may not mean that your computer is infected, the file is simple being rejected from being uploaded by Creative Cloud because it is detecting something.
I will update new information as soon as I have it as I know you are keen to have this issue fixed.
Thanks
Warner