Done quickly and efficiently. I'm a newbie on this site, but I have 16 years experience (Adobe Flash IDE, as3(as2), Air, Flash Builder, Adobe Photoshop, etc.).
In this case I see two item
1. Need to decompile file. This is can be success or not
2. To create GIF (to way is there. If that animation place in time line flash can convert it, If no - need to create add develope for get screenshots from each frame and save it for convert in complete gif after finish)
I don't know about success this problem now, but I can try it
THANK YOU!