As soon as you add or delete a single byte, you can get error messages from PDF readers who may no longer be able to open it, because the PDFs internal ToC is corrupted, which is based on byte-offset calculations. (Careful when manually editing PDFs! You need to know a lot about their internal syntax in order to do this right. To re-compress the expanded.pdf again after editing, you can run: qpdf expanded.pdf orig2.pdf (There may still be some binary blobs in there: for example, font files and ICC profiles, which wouldn't make sense for QPDF to expand).
Now you can open your PDF in any text editor. The following command de-compresses all streams and all object streams: qpdf -qdf -object-streams=disable orig.pdf expanded.pdf My favorite tool for this is QPDF, available on all major OS platforms.
Regarding your 1st question ("viewing source code, but no binary"): there are a few options which you have in order to de-compress the internal binary streams which are attached to many objects.
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