I received a PM supposedly from a moderator that's really just spam. I didn't find an option to "report this post."
Why don't you contact the moderator from whom you received the spam? I am sure they would not be sending you spam in a PM here, that is not how they roll, so they must have been hacked or something?
I'm the only actual moderator here. Can you please forward the PM to me and I'll deal with it? I'm afraid there's no way to report a PM other than that, sorry!