I reported this 0-day. It used a PDF.JS same origin policy violation to access local files. You should be safe because you have javascript disabled and pdfjs.disabled set to true. There's no way for the script to run. It was on a international news website operating from Russia. The exploit was not on an ad network. The exploit was simply injected on every news article page through an iframe. Therefore I assume the news site was compromised. It could have been deliberately injected by the website operators, but I highly doubt it. The exploit targeted developers or tech-savvy people. On Linux, it targeted the contents of the ~/.ssh directory and some other sensitive files. I should say that I am not a security expert and I came across this 0-day by accident.