JPEXS SWF decompiler 

One of the most used tool for analyzing SWF files is the JPEXS SWF decompiler. Nightly builds can be downloaded from https://github.com/jindrapetrik/jpexs-decompiler. This tool is capable of decompiling ActionScript that supports AS3. The following screenshot shows the JPEXS console:

Besides being able to decompile, it has an interface that can be set up with Adobe Flash Player's debugger. After installing JPEXS, we need to download the flash player projector content debugger from https://www.adobe.com/support/flashplayer/debug_downloads.html.

Open JPEXS and then select Settings->Advanced Settings->Paths. Then, browse ...

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