3D object from CINEMA4D has glowing edge in After Effect
Have a look at how AE is interpreting the footage (right-click it in the project and look for Interpret Footage>Main). Specifically look at how it is interpreting the alpha channel, it could be interpreting a straight alpha channel as pre-multiplied or the alpha channel might be pre-multiplied with another colour instead of black). Have a go at switching between alpha modes, or try setting the pre-multiplied colour to white instead of black.

If that fails you'll need to de-fringe the layer in your comp. A simple choker effect would do the trick.