OSX/Jahlav-C is a Trojan created for the Mac OS X operating system. OSX/Jahlav-C is used to deliver malicious code to the infected computer. The initial installer is distributed as a missing Video ActiveX Object, as described on the
SophosLabs blog.
OSX/Jahlav-C creates a malicious shell script file named AdobeFlash in the /Library/Internet Plug-Ins folder and sets it to run periodically. The script contains another shell script in an encoded format which in turn contains a Perl script with the main malicious payload.
The Perl script uses http to communicate with a remote website and download code supplied by the attacker.