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I used to use MJ PDF, but recently switched to the built-in PDF reader for FOSS MiX file explorer.
I don't know if muPDF Viewer is, technically, free software, but i use it for the completely minimal UI. You can only read and search, it's very limited in a good way.
I haven't been on Android in a few years but it looks like Librera Reader is still being maintained. Works great but somewhat large file size due to being a full-featured e-book/document reader rather than just PDF.