Steam game "Night of Full Moon" contain malware?

Hi,
Avast detected in this game malware. Can I ask for more info about this threat please?

C:\Program Files (x86)\Steam\steamapps\common\Night of the Full Moon\GameAssembly.dll [L] Win64:MalwareX-gen [Trj] (0)

Thank you.

I played this game a week ago, and Avast didn’t detect anything. This means that Avast didn’t protected me from this threat and detects this threat with a delay. In the meantime, the game hasn’t received any updates, so it’s possible that I have some Trojan horse on my computer because I executed this game?