مِن شَرِّ مَا

مِن شَرِّ مَا is a phrase (شِبْهُ الجُمْلَةِ) consisting of a particle and a possessive nominal compound

PhraseParticle / Noun / NounNounNounParticle
 شِبْهُ الجُمْلَةِجَارٌ وَمَجْرُوْرٌ وَهُوَ مُضَافٌ وَ مُضَافٌ إِلَيْهِمُضَافٌ إِلَيْهِاسْمٌ مَجْرُوْرٌ وَهُوَ مَضَافٌحَرْفُ جَرٍّ
PhraseParticle and possessive noun compoundpossessive nounGenitive noun + Noun possessedParticle of pulling down
  
 مِن شَرِّ مَا=مَا +شَرِّ+مِن
 from the evil of whatwhatthe evil offrom
Surah/Below is the only verse in the holy Quran containing the compoundمِن شَرِّ مَا
Verse
113-2From the evil of what He has createdمِن شَرِّ مَا خَلَقَ