Linux server, recover from malware, ClamAV install

I have a server running on Centos which has recently been hit by some malware and needs assistance in recovering it. Unfortunately, I don't have a backup of the server data, however, it looks like the Wordpress theme and plugin directories may have become compromised. I am looking for somebody to immediately install ClamAV on the server, conduct a full malware scan, and recover any data that can be salvaged. Any other measures or precautions you can take to make sure the system is stable and secure would be a huge bonus.