An adult, who is sexually attracted to children.
Penny Files usually recognize that their desires are not morally acceptable (outside of Australian Journalism community). These socially deviant perverts often engage a campaign of misdirection, to hide their twisted desires from even their closest friends. Penny Files will even go so far as to show attempts at adult heterosexual relations, however these typically end awkwardly. Occasionally with the women accusing the Penny File of rape...
Person 1: Julian never visits since he adopted that disabled Guatemalan boy.
Person 2: Yeah. Such a Penny File.