#Does clamxav remove viruses pdf#

For the sake of continuity, weвЂ™ll call this latest file вЂњBinarењ“.вЂќ Binary2 then executes and downloads the third binary, which opens up a backdoor on the OS X host designed to allow attackers to administer the machine from afar. Upon execution, Binary2 downloads another binary from and saves it as /tmp/updtdata. This is merely a decoy, as Binary1 continues to extract Binary2 from itself - also into the вЂњtmpвЂќ directory - and then runs the file.

#Does clamxav remove viruses pdf#

Mach-O, short for Mach object, is a file format for executable files on OS X.ДЄccording to Aquilino, when you run Binary1, it will extract the PDF file from its body, drop it in the MacвЂ™s temporary or вЂњtmpвЂќ directory, and then open it. Aquilino said the sample is a plain Mach-O binary - which weвЂ™ll call вЂњBinary 1вЂќ, that contains PDF file and another Mach-O binary (Binary2). I wanted to understand a bit more about how this Trojan does its dirty work, so I contacted Broderick Aquilino, the F-Secure researcher who analyzed it. F-Secure was careful to note that the payload installed by the dropper, Backdoor:OSX/Imuler.A, phones home to a placeholder page on the Web that does not appear to be capable of communicating back to the Trojan at the moment. F-Secure said the Mac malware, Trojan-Dropper: OSX/Revir.A, may be attempting to copy the technique implemented by Windows malware, which opens a PDF file containing a вЂњ.pdf.exeвЂќ extension and an accompanying PDF icon.