I don't think this will be all that helpful in determining what the issue was but after I removed the file from quarantine, it now runs without triggering the issue, which also means I can't replicate it to see if there's any additional information that might point to the problem.
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I think it's a false positive. Over the years, grabbing random roguelikes from around the internet, I often get them. Apparently lesser known files can trigger some virus detectors just by virtue of being lesser known. Let me know if anything else pops up, and I'll see if anyone else chimes in with the issue. But I just ran about 60 different tests to see if I could determine anything amiss, and it's checking out as fine no matter what angle I take. Thanks again for bringing this to my attention!