<span>The download link contains forensics200.obj. The OBJ extension indicates an object file that is most likely a 3D model representation. After some googling, I decided to use Open 3D Model Viewer. The description also tells us that this task has something to do with steganography. With that in mind, let us open the file. 
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After playing around with the tool settings and filters, we can easily view the flag by applying Mesh 0 and enabling the shading effect (which alters the blend/transparency) on our 3D model.



This gives us the flag: RC3-2016-St3GG3rz