In your Mac, launch any application. For example, if you are using Microsoft Word, open the document you want to save as a PDF.
Problem: Error in saving as Adobe PDF
In macOS Mojave (v10.14), when you try to print a document to PDF, using the System Print Dialog > Save As Adobe PDF, the following error message is displayed: "This workflow contains the action Save As Adobe PDF, which is provided by a third party. Third party actions must be explicitly enabled."

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Select File > Print, or press Cmd + P.
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In the PDF drop-down list, select Save As Adobe PDF.
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You get an error: "This workflow contains the action Save As Adobe PDF, which is provided by a third party. Third party actions must be explicitly enabled."
Solution
To resolve the problem, follow the steps below:
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In Mac, launch Automator.
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Go to Automator > Third Party Automator Actions.
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The Third Party Automator Actions dialog is displayed. Select the Enable Automator Actions From Third parties option
and click OK.You can now print your documents to Adobe PDF.
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