Do commercial AV suites examine image files (pictures) for potential malware that might be imbedded via steganography? Is this a concern for most?
I deal with a lot of imagery data and am wondering what the risk of exposure is.
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Executable code embedded in an image, malware or otherwise, does nothing without an external program capable of acting on it. Granted there have been a few cases in the past exploiting errors in the image processor code to force an overflow into the embedded malware code, but with rare exception, steg content is not a direct threat.
A common practice amongst high security sites is to translate all arriving images to a different format such as JPG to PNG in an isolated handler. You can do this a well if you like, but the threat is miniscule.