Answer
You should really ask the print shop about how to set up your file. They should be able to send you a template of the punch form used and give you some guidance.
That said, a PDF can only ever be rectangular.
My guess would be that the print shop needs a file where the irregular shape touches the sides of the rectangle. The bleed is added all around the irregular shape.
Some examples:
The yellow area is your design, the cyan stroke is the document bounds and the magenta stroke is where the final print is punched.
Attribution
Source : Link , Question Author : Suraiya Abedin , Answer Author : Wolff