Please do not upload these file to VirusTotal (VT).
These files are supposed to be unrecognized by VT, and if you upload them
VT will begin to recognize them, and tests that rely on the fact that they
should be unrecognized will start failing.
If you need to know whether or not a file is recognized by VT, the correct
way of doing that is to search for the file's hash in VT, rather than uploading
the file itself.