It will be interesting to see if it was a independently developed *new* worm exploting a previously unknown vulnerability, or a just a variant of an existing exploit.
My bet is someone just figured out how to use an existing base worm and modify it for this explicit purpose targeting what perceived immoral websites. Nothing really to worry about (yet) - the difference between developing a new mode of attack on an OS and using an already established methodology that attacks unpatched servers that you got off the internet is the size of lightyears.
They are learning, tho.
It looks like it's new, but it's a trojan, not a worm. To get infected you'd have to download a file with it inside.
Oh, and don't fool yourself about them "learning". With all fo the IT offshoring going on, many people in Pakistan and India (which has a substantial Muslim population) have become highly skilled programmers. There are ALREADY live viruses in circulation that have originated in that part of the world, so it was only a matter of time until an Islamonazi variant appeared. This one does no damage if you shut down the porn site and is easy to remove, so it's not much of a "threat". An Islamonazi worm, set up to destroy data, could do far more economic damage.