I did a search and the last time this virus was mentioned was 2016 and was reported to Avast.
It is not a virus but a exploit .... JS:Pdfka-gen [
Expl]
Exploits take advantage of vulnerabilities in software. A vulnerability is like a hole in your software that malware can use to get onto your device. Malware exploits these vulnerabilities to bypass your computer's security safeguards to infect your device.
Upload one of those PDF to
www.virustotal.com and scan it
Post
link to scan result here
What PDF reader do you use?
Is it updated?