You can show a PDF document on your page by using the image app for a single page or the slide show app to show multiple pages.
In both cases you import the pdf in the same way you import an image (in the image catalogue). In case of a single page PDF document a single image is created. In case of a multi page PDF document an image is generated for each page and these will be placed in a folder with the name of the pdf.
See the help pages for the image app, slide show app or the media section of the designer page for more information on how to import a PDF document and show images on your pages.