You can certainly find software that can be used to work with Shockwave Flash content and allow you to extract various multimedia from .swf files, including video, audio and pictures. Audio tracks can be saved in many common audio formats like WAV, MP3, MP4 or similar, which means swf to wav conversion is certainly doable.
Open SWF file Open WAV fileA multifunctional media converter for Windows
Universal All Purpose Free Media, Audio & Video Converter Player Recorder
Video converting software