Hello and welcome.
-Which version of OS X?
-Which brand/model printer?
-Do you have more than one printer installed in > System Preferences... > Printers & Scanners
-Do you have Adobe Acrobat installed and is there a PDF printer shown in the above preference pane?
-If more than one printer, which is set to be the default printer?
-Which application is having this issue, or is it all?
C