I'm not saying it is a definite problem, just that it was flagged. After download to the desktop, I tried to open it and it was flagged. I then tried to open it and it opened in the Sumatra PDF program that then still doesn't open and provides a link within the PDF (see screenie) clicking on the link takes you to https://unilik.pro/documents/Profession ... niques.pif. It is at that point that Bitdefender flags it as unsafe. I went no further and posted my warning. Make of that what you will but when a PDF document doesn't act normally my Spidey senses are heightened.
Rgds
DC