Same here. I think it's fair use, It's public service to fight spam. I don't think a judge will side with their argument that we're trying to take advantage of their great reputation :-). Just like with any claim troll without merits, the best course of action is to ignore them.
I received the same email and attachment. Talked with the local police and they said it seems like a scam and told me to contact Finnish Communications Regulatory Authority. So, I sent the email and PDF to them. I’m not taking any of this.