A PDF is a container.
A page is live but you need to know whether meta robots or X-Robots-Tag is telling search engines not to index it.
Website & SEO
Is Google allowed to index this page?
Check a public URL for meta robots, Googlebot and X-Robots-Tag directives and get one clear answer.
Useful to know
Four things worth knowing.
Opening is not the same as correct.
Indexability is not the same thing as ranking, and crawling can be blocked separately by robots.txt.
Check the changed pages.
Look at both the page directives and any crawl restrictions before deciding why a URL is absent from search.
Keep the source document.
A noindex directive controls indexing; robots.txt controls fetching. They solve different problems.