@ jsb85
Good that u explained and accepted the "plagiarism" before committing the crime!!!
In any case, you are not supposed to "blindly" copy them, before anything request your HR to REWORD the duties and then add some meat, spices, onion etc etc.
What i did was, i provided the printout (avoid soft copy as it leads to copy/paste) and soft copy of official JD to your supervisor and ask him to provide an honest description of your duties (aligned to the broad outline provided under NOC description). Then he should send it to HR. The best benefit of this exercise is that when i gets call from VO for verification, he will use similar words as written in your experience letter, which will substantially boost VO's confidence.