The first documented Mac virus predated some of the first PC viruses by a good four years. While conventional wisdom has always assumed that Macs are inherently safer than PCs, wider adoption of Macs in recent years has given rise to new and more sophisticated threats. As this slideshow of Mac Malware through the years shows, however, Apple machines are no strangers to malicious software. Many suggest that Apple s honeymoon with malware authors may be over, but this slideshow shows that Apple machines have been hit by malicious software for over 30 years.
Source: https://threatpost.com/slideshow-bad-apples-mac-malware-through-years-042912/76495/