Yes you can, follow these steps on the mobile/tablet app:
  1. You will firstly need to save the PDF to your device folders via your iCloud or Google drive so that you can select it later on
  2. On your CookBook dashboard chose 'Add Recipe'
  3. Select 'Scan from image (OCR) then tap 'Select PDF page'
  4. Go to your phones folder where the PDF is saved and tap on the file
  5. If there is more than one page within the PDF it will ask which page you would like to import from
  6. From here it works as normal through OCR scanning where you can select the title, description, ingredients etc.

Unfortunately you cannot currently import a .PDF file into the website, you would need to copy and paste the information into the available text boxes from the .PDF