Considering Mac books are safest and fastest this does not hold true anymore!
Mac Trojan Masquerades as Chinese-Language PDF File
Researchers have analyzed a new piece of malware that masquerades as a PDF document and executed malicious code when opened. What makes this Trojan unusual is that it targets Macs.
Trojan, which uses a "double extension" trick where a second file extension is added to the file to hide the fact that it is an executable. It's an old trick in the Windows world, and successfully tricks users because of the perception that PDF files are safer to open than other file types.
The Mac malware has two parts, a dropper file that downloads the actual backdoor Trojan which connects to a remote server and a Chinese-language PDF file about the Diaoyu Islands. Also known as Senkaku Islands, both China and Japan claim sovereignty over the island chain.
"Because the document is opened, users may believe that they have opened a harmless PDF rather than run a program,"
Instead, the Trojan is sending information collected from the infected system and executing instructions sent from the command-and-control server.
While it is still a low-risk Trojan, it is a sign that malware authors are beginning to use Windows tricks to go after Mac users.