I'm going to forward this to our Abuse Compliance Officer so that he may investigate this issue further. This may take up to 24 hours or more for him to reply, so please be patient.
I'm attempting to locate the cause for how your account was compromised less than 24 hours after it was created. Needless to say there is a problem somewhere.
I was unable to locate how it was compromised, but I did remove the shell script in question. I would highly advise attempting to locate the cause yourself and update whatever software you're using - if it were to happen again I cannot guarantee it'll be able to be unsuspended again.