While I can't say for certain what was behind the choice ... the meaning is pretty obvious to anyone who knows Latin. "Bene-" is the Latin root for "good" and "Mal-" is the Latin root for "evil", so "maleficent" is like "beneficent" except ... y'know ... evil instead of good.
The cast of M Is for Maleficium - 2013 includes: Jane Stillwater as Rose
M Is for Maleficium - 2013 was released on: USA: 19 October 2013 (internet)
Maleficent's Dragon form
Maleficent will be on DVD October 28,2014!
Maleficent
The Production Budget for Maleficent was $180,000,000.
Angelina Jolie as Maleficent .
She was a maleficent fairy, full of evil and deceit.
'Maleficent'
Malefice was created in 2003.
The Movie MALEFICENT will be in stores by January 2015.
The exposition of "Maleficent" introduces the character of Maleficent as a powerful fairy protector of the Moors. It establishes her bond with Stefan, who later betrays her, setting the stage for Maleficent's transformation from a benevolent figure to a vengeful villain.