How to analyze the space usage within pdf document?
Solution 1:
The tool you are looking for is the Audit Space Usage tool in Adobe Acrobat. This tool will give you a byte by byte breakdown of which components of your PDF are contributing to the file size.
Here's a video demonstrating how to find the Audit Space Usage tool. For some reason Adobe has hidden it in Acrobat.
The feature can be found under File > Save as... > Optimized > Audit space usage.