Pakistan has largely been shunned by teams since 2009 when gunmen attacked a bus carrying Sri Lankan cricketers, injuring six players and killing six security personnel and two civilians.
The incident has forced Pakistan to play their 'home' matches in the United Arab Emirates and the country has since remained starved of international cricket at home, barring Zimbabwe's limited-overs tour in 2015.
"We have bought these four Coaster buses as part of our efforts to revive international cricket in the country," a PCB spokesman told ESPNcricinfo.
"There will be high expectations from teams willing to visit Pakistan and we want to ensure that we provide them with the best possible arrangements.
"Having these bulletproof vehicles would play a major part in convincing teams (about security arrangements)."
"We have to have discussions with the (overseas) players about their safety and security and I think this new addition in our security facilities will definitely give us an edge," the spokesman said.
"Our ultimate goal is to revive international cricket, and we are doing our best to make sure we can."