Wait, Linux needs antivirus and anti-malware solutions? I thought it was immune to such things. Perhaps a bit of clarification is necessary here.
First and foremost, no operating system is 100 percent immune to attack. Whether a machine is online or offline, it can fall victim to malicious code. Although Linux is less prone to such attacks than, say, Windows, there is no absolute when it comes to security. I have witnessed, first hand, Linux servers hit by rootkits that were so nasty, the only solution was to reinstall and hope the data backup was current.