Import PDF at runtime or as assets with the PDF Importer plugin.
With the PDF Importer plugin, PDF can be drag-and-dropped into the assets, just like any image file. They will be converted to texture to allow using them in your project.
If you need PDF import at runtime, several blueprints nodes are provided to dynamically load a file as texture, so it can be used in either a UI widget or in a dynamic material instance. It can be used to display documents fetched over the network, to display in-app the user documentation, etc.