I just found this announcement. It should help with getting your files back:
Unfortunately your machine, zuma, was hacked very late last night. We moved zuma to clean
new hardware and patched the exploit that was used (the initial exploit was for Awstats, which
we announced about three days ago...upgrade your scripts!)
We've also upgraded all of our other machines, so they're not vulnerable.
It appears that a few people's sites had their index.html files overwritten by the hackers. If this
happened to you, you can quickly and easily restore from our backups by following this KBase