Thanks you for telling us this important information about this latest development that's now a serious threat to our security. What I was familiar with as a means through which hackers can easily access my device with is through them sending links to my email in form of spam and then when I click it they get access to some of my private information. I never knew that it has gotten to the level where by granting them access to your PDF they can get your crypto information and still from you in the process.
You just made a viral point popularly known to be technique which scammers uses to gain access to victims Privacies but the pdf reader which Op iw talking about is a unique one which most internet account users like you may not know about. So it's an undergoing tricky trend with lot of sensitive malicious programs redirecting users with the operating system command. So abiding to the vindictive instructions is a warrant access of the striker to to compromise your datas.
So always stay guided and alert that the scammers are always smarter than you'd ever think.