Office can insert a PDF as an object through Insert, Object and Create from File. Browse to the PDF and confirm the insertion. Microsoft's guide distinguishes this attachment-style approach from converting and incorporating the PDF's text into the document itself.

Attach a PDF Object Within an Office Document

The inserted object can be resized, but its contents are not edited through the surrounding Office file. If the aim is to reuse editable paragraphs, open or convert the PDF in an appropriate application instead.