So you want to view the original Excel spreadsheet from which the PDF was created?

If so, that isn't possible. The Excel spreadsheet is not embedded within the PDF.

You either have to go back to the source -- i.e. the Excel spreadsheet before it was converted to PDF -- or you have to convert the PDF to Excel.

Converting PDF to Excel is a somewhat difficult process (depending on the PDF) so the quality of the output might vary.

Search Google for PDF to Excel and you'll see some options.