Transcription factor that positively regulates the expression of the gene cluster that mediates the biosynthesis of dihydroxynaphthalene (DHN)-melanin, a bluish-green pigment forming a dark layer in the conidial wall that protects the conidia from UV radiations (PubMed:28517364). PfmaF assists PfmaH in promoting melanin synthesis. PfmaF may function as a broad regulator promoting also other secondary metabolism as well as fungal development (PubMed:31116900). Does not affect the production of scytalone.