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: Prequel (A Good Man Goes to War))

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.