You can import PDF files like any other assets via the asset manager. PDF files will be imported as image sequences. Each page of the PDF will be an image of that image sequence which can be played in Portal Hopper as an automatic presentation with a specified time interval per image or can be controlled via signals or logics.
World Builder is using Ghostscript for converting PDF files to image sequences. Ghostscript is installed during the installation of World Builder. In the importer settings you can change the DPI value of the PDF scan.
See also:
World Builder – Images & Image Sequences
World Builder – Importers