You can just use the built-in app called Preview. No need to purchase or download a third party app like Adobe.
Preview is the default app on the Mac for opening images and PDF's (although, for many people, Adobe has taken over as their default viewer.)
By sorting the required PDF files using Finder, then selecting them, then opening the set of selected files with Preview, you can easily generate a merged document.
Find out more in the iTandCoffee Handy Hint on this topic, which includes written instructions and a short, easy-to-follow video.
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