The traditional D1000 table to determine weapon properties as pdf.
A chaos weapon usually has D3 properties.
A sample weapon:
Properties: 3
442, Knowledge Thief – the weapon can learn a skill possessed by a defated enemy
957, Weapon Breaker – the weapon can destroy other close combat weapons
288, Glutton – the weapon adds additional combat dice as it is feeding, i.e., after defeating enemies
Other than that, it is a normal close combat weapon (+0.2 Fractional CAF).