Weak
graded by Al-Albani
Mishkat al-Masabih 1495
وَعَنْ أَبِي جَعْفَرٍ: أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ رَأَى رَجُلًا مِنَ النُّغَاشِينَ فَخَرَّ ساجا. رَوَاهُ الدَّارَقُطْنِيُّ مُرْسَلًا وَفِي شَرْحِ السُّنَّةِ لَفْظُ المصابيح
Abu Ja'far said the Prophet saw a dwarf and prostrated himself. Daraqutni transmitted it in mursal form. Sharh as-sunna has the same wording as al-Masabih.
Cited in Mishkat al-Masabih (No. 1495).