Should I use rel="noindex nofollow noopener or rel="nofollow noopener, to noindex a pdf on my page?

So,
I have seen an error on my search console that a few pages are not indexing due to presence of this tag (rel="noindex nofollow noopener). I have used these tags to noindex a particular pdf on my page. Here is the page link - https://career.guru99.com/fr/top-15-painter-interview-questions/.
Now this tag (rel="noindex nofollow noopener) is present on my other pages also but those pages are indexing. Here is the link to that page - https://career.guru99.com/top-15-painter-interview-questions/.
Please help in this case what is right?
I have used this tag (rel="noindex nofollow noopener) but due to this my whole page is not indexing - https://career.guru99.com/fr/top-15-painter-interview-questions/.
Same tag is used in my previous pages but those are indexing - https://career.guru99.com/top-15-painter-interview-questions/

I would just use another way of noindexing your pdf files rather than using the rel attribute. You can do so either through robots.txt like this:
or via .htaccess: