The climbing took place between 4 and 6 am local time Friday morning, Darik radio reported.
Petya Kolcheva made history as part of an American expedition and was accompanied by her husband Kamen Kolchev.
Kolcheva has been scaling mountains for years on end, including Cho Oyu (8201 m), the world´s sixth highest peak that provides the most straightforward opportunity for mountaineers to ascend above 8000 meters.
Her husband Kamen Kolchev is co-chairman of the Board of Directors of Elana financial holding.
Hristo Prodanov was the first Bulgarian to climb Mount Everest in 1984 but died on the way back.
SNA