The PDF object
which is a preset List object for a PDF document. By default, each page will show for 10 seconds. This can be changed under the List object properties.
In the Objects tab, double-click on the PDF icon, click it and drag into the edit area. This will take you the the PDF properties window.
General 
- File - Select a PDF file.
- Pages - Specify which pages to import.
- All - Includes all the pages in the document.
- Range - Set a range of pages to import from the document.
Import and Convert to Images
- Navigate to the Movie tab in Composer
- Click the 'Import PDF' dropdown:
🔎︎ - The selected PDF will be converted to images.