A family of Microsoft word processing software products for creating web, email, and print documents.
If the scanner's software doesn't include Optical Character Recognition (OCR), then the PDF will contain just pictures of the scanned pages. Opening that PDF in Word will also contain just pictures, not editable text.
If you have OneNote, paste the scanned pictures into a OneNote notebook. Right-click a picture and click "Copy Text from Picture" in the menu. That "reads" the picture and puts text on the clipboard, and then you can paste the text into either OneNote or Word. This is very basic OCR; it won't retain the formatting of the original and it may make a lot of errors that will need corrections.
You scanner may include an OCR program in its software bundle. If there is one, try using it. If you need a more capable OCR, use a web search to compare reviews of the many third-party programs that are available.