Unless you open the pdf in gimp or something (and it's not just a photo, which would be equally bad in a word document) you should be able to copy from a PDF too.
Had Javascript on my resume, and the recruiter send me to an interview for a Java programming job...
The other one asked me to take an online test about cryptography algorithms in node js for a prescreening interview, which is something I never even remotely had to deal with in more than 20 years working for multiple e-commerce, health systems, CMS and other services and websites. Also, no Google or any online sources allowed to solve their questions...