Pilfer doesn't work on Vurst
Oh.. Huh. It looks like this is a rule I missed as well, but now I see it in the base rulebook explicitly.
Boss Minions wrote:
For example, Captain Vurst is unaffected by any rules or powers that only affect rats.
With something that explicit, I guess it answers my question that no, Malodor is not a "rat", mechanically speaking.
I haven't faced off against Malodor with Filch yet, but I have a replay of a failed Chapter 3 coming up and I was thinking of changing the team around, so it could become relevant.