Developer mc-17 has released ps4_pkg_tool, a Python utility to work with PS4 pkg files (extract files, get info from the contents, etc…). Because the script is in Python, it should basically work on your platform of choice, whether it’s Windows, Linux, or Mac.
What is PS4-pkgtools
PS4-pkgtools is a Python utility to retrieve info from a PS4 PKG file, and extract files from it.
Extract
python3 main.py extract File.pkg --file 0x126C --out out.mxl
Extracts file with ID 0x126C to out.xml. The argument to --file can be a file ID or filename
python3 main.py info File.pkg
returns:Extracts everything to directory extracted
Dump
python3 main.py dump File.pkg --out extracted
Extracts everything to directory extracted
Download PS4-pkgtools
You can Download PS4-pkgtools from the developer’s github here. You will need to install Python in order to run the script.