unpdfmenu.dll is a deskUNPDF Shell Menu
belonging to UNPDFMenu ContextMenu Shell Extension
from Docudesk Corporation
Non-system processes like unpdfmenu.dll originate from software you installed on your system. Since most applications store data in your system's registry, it is likely that your registry has suffered fragmentation and accumulated invalid entries which can affect your PC's performance. It is recommended that you check your registry to identify slowdown issues.