I am using Adobe Acrobat X Pro 10.1.8 on a Macintosh. When I create a digital signature, there is a checkbox option in the "Configure Signature Appearance" window (under Acrobat->Preferences->Security->Digital Signatures) which, when checked, displays the Acrobat logo in my digital signatures. Is there a way I can replace that logo with my corporate logo, made suitably transparent in a PDF like I have for a scanned version of my wet-ink signature? In this way, I can create various versions of my signature for personal use (with just my transparent scanned wet-ink signature) and corporate use (with both my transparent scanned wet-ink signature on the left and my transparent scanned corporate logo on the right and other information like reason for signature, location, contact email, etc.). After all, since the document is a PDF, it's already obvious it's Adobe Acrobat. What isn't obvious is who signed it and who the signer is affiliated with (i.e., me and my company, not Adobe).
I don't have an answer for you, but something to think about. When working with signatures, it's very important (in my view) to move away from judging ANYTHING by looking at the page. That's the old "wet signature" way. A PDF page could have any icon, name, signature, or convincing text. What really matters is validating the signature and confirming it really is signed by the trusted authority you hope it is. Anything fancy on the page just distracts from that.