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I'm trying to sign a PDF file.

I bought a certificate from GlobalSign. They sent me a .pfx file that I converted to a .pem file. Then I signed the PDF using your code:

require_once $root.'Libraries/phpdocx-premium-9.5/classes/SignPDF.php'; 
$sign = new SignPDF(); 
$sign->setPDF('Test.pdf');
$sign->setPrivateKey('Test.pem', 'phpdocx_pass'); 
$sign->setX509Certificate('Test.pem'); 
$sign->sign('Test_signed.pdf');

'Test_signed.pdf' is created and I can see the signature in it when I open it with Adobe Acrobat Reader.

I can see my name on it, but Adobe displays a message saying that the validity of the certification is uknown because they can't authenticate me.

What am I missing?