@petneb. I think the mime type detected for that file depends on your server. The mime, application/octet-stream, is really a general purpose mime type. What you need to do is to find out what mime type your web server detects for the adobe files that you want to upload.
To help you out, I have a test_script that will allow you to see what mime type is being detected by your web server. Please try it out: test_script