What morphological type is al-mufattal?

Imruʾ al-Qays: Earlier Loves, Fragrance, and Dārat Juljul (Verses 7–12)

• Active participle on fāʿil
• Passive participle on mufaʿʿal
• Imperfect verb on yafʿal
• Verbal noun on fiʿāl