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ProjectSend
ProjectSend is a free, open source software that lets you share files with your clients, focused on ease of use and privacy. It supports clients groups, system users roles, statistics, multiple languages, detailed logs... and much more!
Did you have a look at Projectsend ?
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Nutrient
Nutrient – The #1 PDF SDK Library, trusted by 10K+ developers. Other PDF SDKs promise a lot - then break. Laggy scrolling, poor mobile UX, tons of bugs, and lack of support cost you endless frustrations. Nutrient’s SDK handles billion-page workloads - so you don’t have to debug PDFs. Used by ~1 billion end users in more than 150 different countries.
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ffsend
:mailbox_with_mail: Easily and securely share files from the command line. A fully featured Firefox Send client.
I would also recommend https://github.com/timvisee/ffsend
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Would be very easy to make with PDF.js as a viewer (as you can provide an inline PDF viewer, and use javascript to easily report on what is being viewed. You'd need to create the user authentication and file browsing.