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Steal this Code
Decompiling SWFs for fun and profit
Doug McCune
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Who am I?
Flex developer
Blogger: dougmccune.com
Author: Adobe Flex 3.0 for Dummies
Principal Software Engineer @
doug@dougmccune.com
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What am I going to talk about?
What’s in a SWF?
Decompiling tools
Example: decompiling Photoshop Express 
What you get, what you don’t
Example: fucking with Natzke
Was that made with ______?
Security implications
Example: implementing the Photoshop Express filters
Obfuscation and Encryption
The moral lesson
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What’s a SWF?
ActionScript Byte Code (ABC)
Embedded graphical assets (swf, png, etc)
Shapes drawn in Flash Authoring
Frames, timeline nonsense, and the rest of 
the weird stuff you designers like
For more than you ever wanted to know about SWF files:
http://www.adobe.com/devnet/swf/
http://www.adobe.com/devnet/swf/pdf/swf_file_format_spec_v9.pdf
http://www.adobe.com/devnet/actionscript/articles/avm2overview.pdf
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What’s a SWF?
ActionScript Byte Code (ABC)
Embedded graphical assets (swf, png, etc)
Shapes drawn in Flash Authoring
Frames, timeline nonsense, and the rest of 
the weird stuff you designers like
For more than you ever wanted to know about SWF files:
http://www.adobe.com/devnet/swf/
http://www.adobe.com/devnet/swf/pdf/swf_file_format_spec_v9.pdf
http://www.adobe.com/devnet/actionscript/articles/avm2overview.pdf
I don’t care
the good stuff
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Decompiling Tools
Sothink SWF Decompiler
$80, Mac or PC, works great
Nemo 440
free AIR app, generates ABC bytecode
swfdump
free, included in Flex SDK, dumps ABC bytecode
abcdump.as
free, part of the Tamarin project
ActionScript Viewer (ASV)
$80 only AS3 support in “prerelease” version, PC only
How easy is it?
Let’s decompile Photoshop Express 
in a few seconds
But there’s a catch
while (_loc_8 <= 30)
{
_loc_9 = 1;
_loc_10 = tTable[_loc_8];
_loc_11 = Math.sqrt(1 + _loc_10 * _loc_10);
_loc_9 = _loc_9 / _loc_11;
_loc_10 = _loc_10 / _loc_11;
_loc_12 = _loc_3 - uTable[_loc_8];
_loc_13 = _loc_4 - vTable[_loc_8];
_loc_14 = (-_loc_12) * _loc_10 + _loc_13 * _loc_9;
* actual code from Photoshop Express
What you get and what 
you don’t
You get:
package structure
class names
method names and signatures
class-level variable names
You don’t get:
most local variable names
method parameter names
for loops (turn into while loops)
sometimes initial variable assignments
Comparing ActionScript, ABC 
bytecode, and decompiled source
Example ActionScript function:
public function mySuperSecretSauce(input:String):String {
var size:Number = input.length;
for(var i:Number = 0; i < size; i++)
{
if(input.charCodeAt(i) > 32)
{
return input.substring(i);
}
}
 
 
 
return "";
}
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