Cloud AV 2012 is a compound that consists of many components. It is not a tiny program, but most of its downloads are performed through vulnerabilities which are mostly used by infections of much lesser size.
The compound is often downloaded stealthily divided into a number of constituents. Then the constituents are assembled into the system aimed at cheating user by showing silly animation and graphics to make an impression of looking for viruses and other security activities.
At the same time, other executables of the malware are busy to oppress host computer through binding its CPU sources and harming particular applications.
Remove Cloud AV 2012 as a misleading product that follows the schemes of its nasty forerunners such as AVSecurity 2012, Cloud Proetction. Just like the predecessors the malware practices blocking innocent and quite robust program to popup alert like this: "The file <program name> .exe is infected. Running application is impossible", where <program name> is a name of popular program, e.g. IE, that has just been terminated by the malware.