Adobe bundles the Acrobat Chrome extension with Adobe Acrobat Reader DC so that you can easily open PDFs in Reader while browsing the web. Once installed and enabled, the extension will allow you to open PDF files in Acrobat reader in Chrome. The extension is not installed automatically with the default PDF owner on your computer, you’re prompted to install the extension. Once the extension is installed and activated, you must activate it before use. The Chrome extension will offer access to all the tools you need to add comments, fill forms, and sign PDFs.”]
Source: https://helpx.adobe.com/acrobat/kb/open-in-acrobat-reader-from-chrome.html