Creating keyboard shortcut for converting a file (photo or document) to pdf
Simple solution with Automator if you are just handling images 

You can batch convert these files by:


Open Automator from /Applications
Create a new Service
Drag the Get Specified Finder Items to the workflow builder.
Drag the New Pdf From Image to the workflow builder
Save the service &amp; bind it your keyboard shortcut preferences


If you're using other filetypes, you may you the Print finder items action. But it will use a popup if I'm not mistaken.