Saving a pending print job as PDF

I sent a confirmation page from Safari to the printer and quit Safari, only to realize that the printer does not actually exist. The only remaining copy of this information is in the print queue.

How do I salvage the information waiting to be printed so I can use it again?

Re-routing the print job to an extant printer would be nice, though more generally I would like to know how to save the file waiting to be printed so it can be used again.