What kind of compression does Acrobat do when files are combined?

I'm working with some raster print media (specifically PNGs) that I've combined and saved into PDFs for easier printing. The original files are 300dpi scans, lossless compression.
This is the process I follow:
select files to combine in Windows Explorer
right click > Combine supported files in Acrobat
File size: Default
wait for the new binder to open in Acrobat
Save As > Save as type > Adobe PDF Files (*.pdf)
So it looks like there are two steps where possible compression occurs, 2 (combine) and 5 (save).
2: The "Default" file size button tooltip says all files are kept at their original quality.
5: No information is given on screen as to what kind of compression is done.
The second file type in step 5, Adobe PDF Files, Optimized (*.pdf), gives the option for "Standard" optimization, which compresses images to JPEG and downsizes them to 150dpi. Is this the setting for the first file type as well?

An ordinary save or save as does no additional compression.

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