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It looks like Google is not crawling tabs anymore, therefore if your pdf's are tabbed within pages, it might not be an issue: https://www.seroundtable.com/google-hidden-tab-content-seo-19489.html

Thanks for the answers guys. @Robert: It is indeed the initial report. Yet I did receive other reports since. Also thanks for suggestion the Screaming Frog tool. The report I get from it will be useful in my discussion with our CRM provider. @Cyrus: I also used URI Valet. I don't understand, the 302 redirects are on picture links. I'll communicate with our CRM provider about that. Also, I don't understand how any of our old URLs could be reached crawling our website as this is a completely new website. No part was transferred over so the shouldn't be any way for the crawler to see our old URLs. Thanks again