Hello,
Not sure about your question, If you’re looking to sign a document you may use adobe pdf sign Adobe Acrobat Sign - RPA Component | UiPath Marketplace
On the other hand, validating signatures is a more advanced topic please find below a document from Adobe regarding validating digital signatures.
Validating digital signatures, Adobe Acrobat
Validating a manual signature is way more complex I would recommend using document understanding and action center, otherwise you may need to consider building a custom ML image classification model
Intelligent Document Processing - Document Understanding | UiPath
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