The PCB said that it carried out random dope test on players during the national T20 championship in Lahore last November.
"The tests were carried out in accordance with the PCB Anti-Doping Rules which comply with WADA regulations. An adverse analytical finding was reported by the National Dope Testing Laboratory (WADA-accredited laboratory) in New Delhi, India against the sample collected from Kashif Siddique Khan, a player of State Bank of Pakistan," the board said.
It said that initially it issued a show cause notice to Kashif and provisionally suspended him from taking part in domestic cricket.
In the past Pakistani fast bowlers, Shoaib Akhtar and Muhammad Asif have also had to face bans after testing positive in international competitions.