I am not sure of the flow and relation of PDF and word document but first you should use a File Trigger and not a Time trigger. The file trigger lets you pick up the name.
So, lets say you use the file trigger on the word doc. Maybe you need to add a Wait Task to make sure that the PDF is complete? Then, use a Rename Task and use original filename from File Trigger to rename PDF document. Then create a Copy files Task to copy the new name to the right folder.
Make sure you use setting "Put Job on queue" on the Job.
The Variables for the picked up file are:
Folder: {TRIGGER(Active,LastTrigger,File.Result.Folder)}
File name only: {TRIGGER(Active,LastTrigger,File.Result.Name)}
Full path: {TRIGGER(Active,LastTrigger,File.Result.FullPath)}