[1] Malling became an attaché at the Ministry for Foreign Affairs in 1938 and served in Rome the same year and in Chicago in 1939 and in Washington, D.C. in 1940.

[1] Malling was first vice consul in Hamburg in 1946 and first legation secretary and chargé d'affaires ad interim in Vienna in 1946.

[1] Malling was then legation counselor and chargé d'affaires in Tel Aviv in 1953[2] and mediator at the Neutral Nations Supervisory Commission in Korea in 1955.

He was then minister at the UN delegation in New York City in 1959 and resident at the representation of UN's technical assistance operations in Iraq from 1959 to 1961.

[6] Malling had been described by Jan Mårtenson as being a "chubby, white-haired and blue-eyed bachelor, jovial and humorous, a little of an aging cherub".