+1(514) 937-9445 or Toll-free (Canada & US) +1 (888) 947-9445
i've never seen this form and neither did I fill it out for my application. If CHC isb is listing it as a required form then do fill it.
 
horizon said:
http://www.canadainternational.gc.ca/pakistan/assets/pdfs/PakistaniNationals-Form-en.pdf

I send this document along with my visa form . .

Just send as much info you can send to VO make him satisfy