Why does resaving an unchanged PDF change the size?

I have a client that sends me a PDF daily. If I take the file I was given, open it in Acrobat Reader XI and re-save it (without making any changes to it), the file size reduces by maybe 20-100kb. How do I determine what is the difference between the 2 files - or what it's doing to make the file smaller?
I began doing this because if I don't, my PDF processing application (Planet Press) - cannot read the file, but once I open and resave it, it works fine.
Thoughts?

It's also possible that the file was damaged and that Reader repaired it. To test for this, open the file, and immediately close it. If there is a prompt to save in this case, it was damaged.

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