Historically they embed an image when doing steg. Gibberish could be another embedded file that needs to be renamed to the type. Sometimes you can tell if the embedded file has headers. You can download irfanview, install all plugins and try renaming to file,jpg — it will try to fix it if it’s an image and detect the file type / offer to rename it.
Can you post the text extracted using notepad - the pass may be embedded outside of the header and EOF - which you can do without impacting the image opening. They have also done this routinely. (Using a hex editor or something to embed plain text in files.) they are found in the Podesta WL. Many of them appear to be corrupt images and stand out more though from doing lousy steg
>https://pastebin.com/mqXN1EdX
Thanks. The only discernible text is HEY;) - which seemed curious. It may be worth checking the original image for text —