Technically, antivirus programs don't look for nasty stuff in general, but specifically for viruses and worms. A virus is a program that spreads itself to other programs, usually through some action involving the user. A worm spreads itself to other computers without any help from humans. The business of hiding destructive scripts in add-on products for Poser is not a virus or worm. It doesn't spread itself. You volunteer to install it yourself, as part of something you think you want. The only copy you end up with is what you explicitly installed. Technically it's a Trojan Horse. While most viruses are presented as Trojan Horses, not all Trojan Horses are viruses or worms.

Meanwhile, it is malware. And there are plenty of anti-malware programs, but this particular one would not rise to the level of awareness that would cause the malware authors to handle it.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)