Use the file command to confirm it is actually a JPEG. If it shows "data" or "octet-stream," the file header might be corrupted.
Use StegSolve to browse through different color planes (Red, Green, Blue, Alpha) to see if the flag is hidden in the Least Significant Bit (LSB). 9d043507-0d89-4c12-8912-c41247c3942f.jpg
steghide extract -sf 9d043507-0d89-4c12-8912-c41247c3942f.jpg Use the file command to confirm it is actually a JPEG