Prime Factor Random Numbers! Task:

Given two positive integers, generate a random integer between them (inclusive) and then output all its prime factors.  

Examples:

Input:   Random Number:     Output:
1,2      2                  [2]
12,46    18                 [2,9]
142,17   40                 [2,2,2,5]


Scoring:

This is code-golf so the least bytes wins!
05AB1E, 4 bytes

Ÿ.RÒ


Explanation:

Ÿ       Create a list [a .. b]
 .R     Pick a random element
   Ò    Prime factors.


Try it online!