Read the following tips in securing your Linode Server with cPanel ClamAV.
Log into your WHM and enable the following plugins.
Home > cPanel > Manage Plugins
It takes roughly 40 minutes for installation to complete..
Now to enable your ClamAV scans to be run and visit the accounts cPanel to access virus scans.. A good tutorial on how to do this can be found here.
Beware of redundancies and how much memory your server is operating with.
Installing ClamAV on a Cpanel server: http://www.thecpaneladmin.com/installing-clamav-on-a-cpanel-server/
spamdconf cPanel plugin: http://forums.cpanel.net/f5/spamd-startup-configuration-spamdconf-tips-46758.html