Where did the Antivirus Soft virus come from?

[Gary]

Antivirus Soft is a rogue anti-spyware and ransomware program from the same family as Antivirus Live. These infections are installed on to your computer through the use of malware that installs the program onto your computer without your permission or knowledge. It is also common for this rogue to be installed on your computer through the use of malicious PDF files that exploit known vulnerabilities in older versions of Adobe Reader.