You can insert a PDF into Google Slides by converting it into images or creating a link to the same. This post covers both methods in detail.

Open the Google Docs file where you want this PDF-as-image to go. Go to Insert > Image > Upload from computer. Select your photos from your local storage.

You can import and add a PDF to OneNote as a file attahcment or printout image, or convert and add PDF to OneNote. Here's how!