OSX/MDropperA is a malware backdoor that is installed via a malicious Java Applet exploiting CVE-2012-0507 or a malicious Word document that exploits CVE-2009-053 [1]. It can be remotely controlled and is capable of downloading and uploading files, executing new processes, and taking screenshots [1].

References:

1. https://www.f-secure.com/v-descs/backdoor_osx_sabpab_a.shtml