Sure, we test it and then we find out its a virus. Too late right?
We analyze the file first and check to see if the virus scans are correct first. After that, we test it if we can and its possible. But that isn't always possible. We're not really going to open up a hack and test it when we're unable to get any type of analysis on it.
After we analyze your file, we delete it. Even your normal attachment. Attach the unpacked version into the thread. No one but the minions of that section & GMOD+ will be able to download your file.
After its checked, it'll be deleted from MPGH & our computers. Its a safety precaution we have to take to ensure the safety of our members.
We can't and won't really test if we don't know what it is.