Dorium Maldovar

Dorium was a black marketeer in the 52nd century.

Biography
He supplied a group of Hooded Figures with a Judoon's brain that contained a security protocol in exchange for a small bag of sentient money. He revealed that he knew the Hooded Figures were planning to kidnap a child and expressed fear at what the Doctor would do in retribution. (DW: A Good Man Goes to War Prequel)

In 5149, After hearing that she was in search of time travel, Dorium met with River Song in the Maldovarium bar to offer her a Vortex manipulator that was, according to him, "Fresh off the wrist of a handsome Time Agent". As payment Song offered him a Callisto Pulse which could disarm Micro-explosives from up to 20 feet. When he enquired as to what kind of micro-explosives the pulse could disarm, she responded by saying the kind that she had just put in his wine. He was then forced to give her the Vortex Manipulator. (DW: The Pandorica Opens)

Behind the scenes

 * Dorium is given the additional name of Maldavar on Simon Fisher Becker's online CV.
 * It seems likely that this (possibly a different spelling of Maldovar) is a descriptive term for an entity belonging to the planet Maldovarium, which Dorium could be.