The attack in South Waziristan, a mountainous region on the country's border with Afghanistan, comes as the military presses an offensive against Tehreek-e-Taliban Pakistan hideouts in neighbouring North Waziristan.
An intelligence official said Taliban militants hiding in the mountains fired into the army outpost, killing one solider and wounding another.
Read: Four soldiers killed as army pushes to finish anti-Taliban offensive
"The army shot back, but the enemy hid in the forest cover," the official said on condition of anonymity, because he was not authorised to speak to the media.
Pakistan began a major offensive in North Waziristan last summer to drive out TTP and other extremist militants who launch attacks on government and civilian targets from strongholds there.
The army is meeting fierce resistance as it moves further into the lower-lying areas of the Shawal Valley, the Taliban's last stronghold in North Waziristan, military officials said.
Read: 1st phase of Shawal operation completed
Over the weekend, four Pakistani soldiers were killed in three separate attacks in North and South Waziristan.
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