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Tesseract has Rust bindings and has been around for a while. It's not clear from your description what you're trying to accomplish, but I think for OCR, tesseract is an easy OSS way to start.
Pdfium can do that. I maintain the pdfium-render crate, which will currently allow you to read (but not yet edit) the text on a page. I'd be happy to add the editing functionality for you. Take a look at https://crates.io/crates/pdfium-render, see if it sounds like it could be useful, and then raise an issue at https://github.com/ajrcarey/pdfium-render and we can add in the additional editing functionality you need.