Do you have a NICOP card or a Shehnakti Card? Having a NICOP card does not pose a problem since it states that you not a resident or citizen of Pakistan but of Pakistani origin.
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You should ask the employer. They should know. After all, it is their requirement.
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Also, if you were born in Pakistan, were issued a Pakistani birth certificate, of already recorded Pakistani origin, resided in Pakistan lawfully, were subject of Pakistani laws and legally eligible to seek (or already had or have applied for a valid Pakistani Passport) then you are a Pakistani national de facto regardless of cards, unless by some legal act you lost your nationality there.
If you desire to clarify your national affiliation with that country, I attach the link to the Islamic Republic of Pakistan that would be helpful for your quest:
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