Hi Sladus,
This depends on what you’re intending to do with the animation.
You won’t need Maya specifically if you have another modeling software that can handle animations like Blender or 3Ds .
Since the Animations from Mixamo are in FBX format you can import those directly to UE4 or you can import them into , Maya, Blender and edit them further.
If you have any specific questions or I missed something feel free to ask! 