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At one time about a decade back, I played with a tool called StegDetect to see if image files in an ebook had information hidden in them when I became curious about an ebook that had rather large for the image size .png images which I noticed when the total file size was way larger than I expected. What I did find was that there were files appended to the image files but near as I could tell, the contents of the appended files were garbage. Running the files through a conversion to .jpg with 100% quality shrank the files to a more reasonable size and converting those jpgs back to png did not show any remnants of the appended file.
It might be the first ebook where I spent a lot more <expletive deleted> time dissecting the file rather than reading it.
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