Diablo – Is a monster’s stats static, or is it based on some random value

Each item you craft randomly selects an appropriate number of properties, based on the levels of the item/blacksmith. As it's totally random, you could very well end up with the same stats on the same items, but it's just luck of the draw (or bad luck, if you're not getting what you want on the item).

For example, last night I created a yellow helm that had 3 properties:

• 1% increased crit chance
• 1.1% damage converted to health
• an empty socket

I created another helmet right after and got

• 11 Intelligence
• 12 Vitality
• +3 damage on hit (I think, drawing a blank on the last property)

Anyway, the point is, yes, it's entirely random.

It is a magic property that gave you +42 strength and +26 vitality.

Hope it helps ;)

EDIT

As Alok wrote in the comment it is most probably the Dauntless affix.

Link: http://www.diablofans.com/topic/41045-spoiler-diablo-iii-item-affixes/