*Updated 12/6/2022 to include % Chance of each bonus
Since there doesn't seem to be Official Documentation on Corruption Crystal outcomes, this thread shall hereby serve as the Unofficial source.
All possible bonuses are applicable to any given item.
They are not specific to any particular item class.
List of Possible Corruption Bonuses:
+1 to All Skills
+1 to Maximum Elemental Resistances
+1% Fire/Lightning/Cold Absorb
+60 Spell Focus
Item Becomes Ethereal
5% Deadly Strike
10% To All Attributes
+25% Magic Find
+3 Light Radius
15% Poison Length Reduction
20% Attack Speed
20% Block Speed
20% Faster Cast Rate
20% Faster Hit Recovery
20% Gold Find
20% Movement Speed
+30 to (Strength or Dexterity or Energy or Vitality)
10% Spell Damage
10% (Fire or Light or Cold or Poison or Phys/Mag) Spell Damage
-10 Enemy (Fire or Light or Cold or Poison) Resistance
15% (Fire or Light or Cold or Poison) Resistance
+100 Life
+150 Mana
Physical Resist +4%
+15 to Maximum Damage
40% Enhanced Weapon Damage
+10 Life Regenerated per Second
-5% to All Vendor Prices
Regenerate Mana +10%
Slow Target 4%
Slows Attacker by 5%
+5% Life
+10% Mana
Requirements -20%
The below image shows the probability of the outcomes... not quite accurately.
unique jewel and another normal one each time
and an umo 
