Unfortunately you cannot.
In order to obtain a visa to Pakistan from a country to which you do not hold citizenship, you need to have a permanent resident status; in other words – if you are in China, Vietnam or Cambodia on a visitor/tourist visa – you cannot apply for a visa to Pakistan.
This is stated plainly at the Embassy of Pakistan in China’s website:
Note:
Nationals of other countries visiting China ( as visitors, tourists)
are advised to apply for visa at the Pakistani Embassy in their
country of residence or the Pakistani Embassy concurrently accredited
to their country.VISAS CANNOT BE ISSUED TO THIRD COUNTRY NATIONALS NOT IN POSESSION OF
THE RESIDENT / WORK PERMIT OF CHINA.
This is further confirmed from Pakistan Tourism Development Corporation (the govt. agency for tourism) it states an exception but in my experience this is rarely granted (and only on humanitarian/emergency basis).
Foreign nationals can only apply
for Pakistan visa from their country of origin OR from the place of
legal permanent residence. Request for visas of a THIRD COUNTRY origin
will be decided only by the Ambassador / High Commissioner / Head of
Mission / Consulate.
Credit:stackoverflow.com‘
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