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Malware request: malicious and safe PDFs


I work for a research organization, and I'm looking into the ability to use machine learning techniques to learn safe vs malicious PDF documents. In order to do this, I need massive quantities of both. I've been able to find 32 malicious PDFs on this website, and was able to crawl the web for 1600 likely safe PDF documents. Does anyone known of some good sources for such things? Thank you.