I think my blog, http://www.animindo.net was being hacked and got google adsense embedded in my theme's code. I found this code embedded to my single.php
I honestly don't know how it got there. I found similar topic few years back http://wordpress.org/support/topic/google-adsense-hack-on-my-blog?replies=14 but the solution I saw was to play hide and seek with the code and then erased it manually. Is there any way to prevent this? Or is it a problem with my host?
PS: if it's any help, I'm using 1140 Starker framework as the base of my theme.