The most common tool used in forensics to extract files from images is Autopsy. Download it, install it and make it ingest the file to find "hidden" files. Note that Autopsy is built to support disk images and other kind of images, but not simple files.
Binwalk is a tool for searching binary files like images and audio files for embedded files and data.
It can be installed with apt however the source can be found on github.
sudoaptinstall binwalk #Insllation
binwalk file#Displays the embedded data in the given file
binwalk -e file#Displays and extracts some files from the given file
binwalk --dd ".*"file#Displays and extracts all files from the given file
Another common tool to find hidden files is foremost. You can find the configuration file of foremost in /etc/foremost.conf. If you just want to search for some specific files uncomment them. If you don't uncomment anything foremost will search for it's default configured file types.
foremost -v -i file.img -o output
#Discovered files will appear inside the folder "output"
Scalpel is another tool that can be use to find and extract files embedded in a file. In this case you will need to uncomment from the configuration file (/etc/scalpel/scalpel.conf) the file types you want it to extract.