That's really a wonderful method , I tried this and I add
As joanthan727 said , print the pdf but don't connect your printer , so the file is temporary saved on your harddisk
Go to C:\Windows\System32\spool\PRINTERS
You will find a file with extension spl or maybe other extensions
download this software which converts it to pdf
IT's a" freeware program":
http://www.verypdf.com/wordpress/201303/how-to-convert-spl-to-pdf-auto matically-by-monitoring-folders-function-35426.html
Another link