Pakistan upset world number one Test side South Africa by seven wickets in Abu Dhabi on Thursday, to go 1-0 up in the two-match series.
The South Africans were bowled out for 232 in their second innings after conceding a big 193-run lead in the first.
AB de Villiers top-scored with 90 in an innings rocked by Pakistani bowlers Saeed Ajmal (4-74) and Junaid Khan (3-57).
Pakistan achieved the 40-run target after losing three early wickets for just seven runs after lunch on the fourth day.
The second and final Test starts in Dubai from October 23.
Brief scores: South Africa 249 and 232; Pakistan 442 and 3-45.