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SWFRETools - A collection of tools for reverse engineering Flash files


The SWFRETools are a collection of tools built for vulnerability analysis of the Adobe Flash player and for malware analysis of malicious SWF files. The tools are partly written in Java and partly in Python and are licensed under the GPL 2.0 license.

The following tools are part of the SWFRETools:

  • Flash Dissector: Binary viewer for SWF files
  • SWF Parser: Build your own tools using this parser
  • Minimizer: Automatically minimize crashing SWF files
  • FP Debugger: Trace the Flash Player dynamically
  • StatsGenerator: Generate stats over SWF files

Flash Dissector

Flash Dissector is a GUI tool that allows you to inspect SWF files on a binary level. When you open a SWF file in Flash Dissector you have the ability to look through the structures defined in the SWF file in a hex editor and in a structure viewer. This makes it easy to understand what bytes of a SWF file hold what functionality.

For more information about using Flash Dissector, please check out the readme file in the Flash Dissector directory.

SWF Parser

The SWF Parser is an open-source SWF file parser implemented in Java that you can build upon when you want to create your own Flash reverse engineering tools.

For more information about using SWF Parser, please check out the readme file in the SWF Parser directory.


The Minimizer program takes a SWF input that makes Flash Player crash and automatically removes the parts of the SWF file that are not related to the crash. This makes it easier to determine what the root cause of a crash is.

For more information about using Minimizer, please check out the readme file in the Minimizer directory.

FP Debugger

This Flash Player hooking script hooks important functionality in Flash Player at runtime and dumps information about what Flash Player is parsing and executing. This is very useful in situations where Flash Player trips up and static analysis are out of sync with what Flash Player is doing.

For more information about using FP Debugger, please check out the readme file in the FP Debugger directory.


The StatsGenerator program can create statistics from an input set of SWF files.

For more information about using StatsGenerator, please check out the readme file in the StatsGenerator directory.


The installation process of the SWFRETools is simple. Assuming you have Java installed, all you need is to download the latest binary package of SWFRETools from

Once extracted, you can use use the tools.

If you want to modify the source code of the any of the tools, I recommend you grab the source code from GitHub using your favourite Git client. The SWFRETools are developed using Eclipse so it makes sense if you used Eclipse too for your work.

The SWFRETools depend on a number of a number of external libraries you also need if you want to compile the tools yourself. The Java tools require

while the Python tools require


Sebastian Porst (

External Software

The SWFRETools use the following external components and libraries.

The Java FileDrop component (Public Domain) to allow users to open Flash files via Drag & Drop.


SWF file reverse engineering tools



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