Mods... I'm going to cite to some outside references and products, which I hope are OK here.
Since .swf is an Adobe file, I assumed that Adobe Media Encoder would be able to convert it, but it turns out that it can't. As explained in this Adobe Forums discussion... Converting .SWF to .MOV or .AVI http://forums.adobe.com/message/3714341
...(.swf) is an interactive file, not a simple video file.
Additionally, "playable" video-only exports of .swf, as I remember, contain something like an embedded player (my guess from what I've read), which probably also complicates conversion.
The Adobe forum discussion suggests several approaches to converting, including screen capture... and it mentions three utilities that should convert .swf to .mov for a Mac. At least one of these utilities, probably all, probably internally converts the video movie output of a .swf file to .mov or .avi... so the process is in essence screen capture without the display.
As I can see that some of the pages aren't likely to be found by search, I'm going to include links to the sites/pages I checked.... Doremisoft Mac SWF Video Converter
...] Convert SWF to MOV
...] SWF to MOV Converter for Mac
I'd check out all the utilities mentioned. I believe that most offer free download or a 30-day guarantee. It's likely that the quality on these may vary enough with the codecs on your system that you could get different results with different utilities.
One of the above pages has a sound file that goes off randomly, so turn your volume down when you visit them. (Adobe Media Encoder, I should add, now is available only through Adobe Creative Cloud... IMO unfortunate. The above utilities are a lot cheaper than Media Encoder in any case.)