Supposing that there's no one from inside evolved, is it possible to have a malicious intermediate between my computer and bitaddress?
Yes. Here's what might have happened:
- Your computer was malware affected.
- Your computer has been spied (not necessarily from an unintended spyware, lots of offices do spy on purpose).
- Somebody at work saw you generating a private key, and took a picture.
- Cameras (if any) caught you generating a private key.
- bitaddress.org was compromised at the time you used it (quite unlikely, it'd have been announced later).
- The printer exchanged sensitive information with your computer, private key included, and someone happened to find read access.
- You screwed it up in the process, and you didn't notice.