Somchai Wongsawat was confronted by protesters who reportedly threw shoes and plastic bottles at him during a visit to a government telecommunications office.
Pakistan seeks to avoid defaulting on billions of dollars in loans and to skirt a financial crisis brought on by high fuel prices, dwindling foreign investment and soaring militant violence.
A remotely piloted United States aircraft was suspected of firing a missile into a Pakistani village in North Waziristan tribal region early on Thursday.
An overnight airstrike by coalition forces that Afghan authorities said killed nine Afghan Army soldiers may have been a case of mutually mistaken identity.