Search engine take PDF as a page and can easily crawl the content in it that means if two identically same PDF will be found on different URLs with 100% same content available in it, logically this should be considered as duplicated content because; it like 2 different URLs providing the same information to search engine, so it should be duplicated.
The hard way: Create your own PDFs (way to costly)
The Easy way: Add link to the original resource like the same you do with articles and images, you pass a link to the original resource to help search engine know what the original piece is.
Another way: Block all the PDFs from search engine so that search engine should not crawl and index them in SERPs. The PDFs will be available for your users but not for search engine.
I just take a quick overview of your product pages and I guess if you block the PDF from search engine it won’t affect much! #ifiwouldbeatyourplace