The strategy

You will be spending more time running away from Malak,then attacking him.Around the level you will see Jedi bodies in large tubes(shown in the screenshot below).Make destroying these tubes your first priority.Malak will use these to heal himself after taking damage if they are not destroyed.Full on attacks don't inflict much damage to Malak as he will block most of your attacks and will usually counter with his Force Lightning,which can deal serious damage.Even if you don't attack him directly he will still use this,just not as often,So be careful.Use Knight Speed to boost your movement speed and keep distance from Malak.Use Force Heal when needed.When you have a fair distance between you and Malak,Throw Your Lightsaber at him.Repeat this step until you beat him.