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Easy-to-use, simple assistant for SWF disassembly.
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RABCDAsm @ 6568793

Robust, Easy [Dis-]Assembler for ActionScript Bytecode

Did you know RABCDAsm, the robust ActionScript (dis)assembler?
redasm-abc aims to provide a simple, easy-to-use assistant to it.

Forget about the export-disassemble-edit-assemble-replace process; note the difference:


$ abcexport file.swf
$ rabcdasm
$ rabcdasm
$ rabcdasm
$ # edit what you want...
$ rabcasm file-0/file-0.main.asasm
$ rabcasm file-1/file-1.main.asasm
$ rabcasm file-2/file-2.main.asasm
$ abcreplace file.swf 0 file-0/
$ abcreplace file.swf 1 file-0/
$ abcreplace file.swf 2 file-0/


$ redasm
$ # edit what you want...
$ redasm


You need a working D compiler to build redasm-abc. It's recommended you install liblzma and its development files, otherwise redasm won't be able to handle LZMA-compressed SWFs.

To build:

$ git submodule update --init
$ rdmd build_redasm.d

If it succeeds, copy the resulting executable to your PATH:

$ sudo install redasm /usr/local/bin

That's it! Now you should be able to do redasm from anywhere.


Put the SWF you want to inspect in an empty directory.
Then run redasm to extract all its ABC blocks and disassemble them.
Edit what you want, then run redasm again to apply the changes to the SWF.

redasm-abc will create a directory for each disassembled ABC block (block-0, block-1, block-2) where its dissassembly lives. You shouldn't rename the directories or modify the SWF externally.


Just after running redasm on an SWF, you should immediately add the files to i.e. Git, even if you're just planning to read the assembly.

git init && git add -A
git commit -m "disassemble SWF"

Also read the tips on RABCDAsm itself.

Before disassembling an SWF for the first time, redasm creates a backup of the SWF ending in .bak, at the same directory.

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