well, sorta plug rush help

. My tumblr out of the blue started showing plugrush ads via pop up windows. Since I didn't install any plugrush ads I am going to guess and say I was hacked and/or have an exploit going on. As I am looking through my html code on my blog theme, what code would I be looking for to remove?
also, would someone from plugrush maybe be willing to help me and we can track down the affiliate doing this shady marketing so they don't get money from their dirty tricks?