I'm trying to import a PDF file in a word document but only the first page is shown.
If you mean that you are inserting the PDF as an object into a document, then you can only view the first page. All linked or embedded OLE objects behave like that in Word.
As an alternative, try to open the PDF directly in Word (as has already been suggested). Depending on how the PDF was first created, you may not be able to edit the file.
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