Tor Website Hack?

Me and a few of my friends are were throwing around some theories on how to hack Tor websites. Almost all of the were complete garbage as one could assume. But we did come up with one that I believe plausible. Is it possible to upload a program to a website then get the website to execute it? What the program would do is Ping a server that would record where the packets are coming from. or maybe make a TCP connection to he server much like nmap does. Would this be a viable solution to hack a tor website or is the just a useless pursuit?