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Since the ebook you got back is not an exact copy of the original, it has been converted. The result should always be an .azw (MOBI) file, but if Amazon can't convert the PDF to text it will instead convert it to images. This was more useful before the Kindle could read PDFs - now it is probably a waste of time.
As Josieb1 says, you might want to try Calibre's PDF to MOBI conversion. Calibre is very easy to use, and is worth installing if you expect to read any significant number of your own documents on the Kindle. However, some PDFs are just intrinsically hard to convert to another format - so don't be surprised if Calibre's conversion is also a bust.
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