As per the issue description mentioned above, you want to disable copy to clipboard function in Acrobat, is that correct?
Could you check if you have "take a snapshot" option enabled by clicking Edit > Take a snapshot. If it is, press Esc key after opening the pdf in Acrobat and see if that resolves the issue.
Let us know if you need any help.
Firstly, I'm really grateful for your suggestion.
I'm sure I didn't have "take a snapshot" option before I select an area, and when I press Esc key, the problem still haven't been solved. And I want to know if this is a initial setting, thank you.
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Could you share dot version of Acrobat and the operating system installed on the machine? You may refer to the steps given in this link on how to check the version in Acrobat: Identify the product and its version for Acrobat and Reader DC
I tried replicating the issue on my machine with Acrobat DC latest version. It copies text to the clipboard if I select an area on a scanned pdf (right-click ) and select "copy with formatting" (below are the screenshots)