What is js:pdfks-aa

I was downloading a file that contained a pdf and before it finished downloading atleast i think it was still downloading Avast detected a virus and stopped it. the pdf was in a .rar i don’t know why it was in a .rar i choose to delete it but i guess cause it was in a rar i wasn’t allowed so i delete the rar and emptied the recycle bin. The file was being downloaded to my partition i have for downloads and pictures ect, i did a scan to that partition and all was clean. i’m currently doing a full scan with Avast and MBAM. but i don’t know what the js:pdfks-aa i can’t find any info, also the end of the file extention was apcs52 .html i never clicked the link or opened the pdf or unpacked the rar so i guess im ok?

Was it a mail attachment?

Lots of spam mails arrive with fake doc, that when open/run will download a ransomware

also see this >> http://www.independent.co.uk/life-style/gadgets-and-tech/google-phishing-emails-attack-gmail-scam-link-doc-invitation-hack-a7716581.html