Definitely not a cat. I have cats and he wanted to go ballistic on me when I tried to get him off the window ledge when there was another cat outside. I had to push him off with a broom or risk losing an eye even though his nails are trimmed. He's lovely otherwise, I swear.
I can't believe how strong my 8 lb cat is. It took both me and my wife to hold her when the vet was examining her. It doesn't help that cats are slippery and have noodle bones.
You can take on a house cat. If it comes down to you or then, and we're talking for real, you're going to be able to hurt that cat. You'll get scratched up, but you can kill it.