If you put a favicon.ico
to the root of your site, then your PDFs opened on that site will actually have that favicon. You can generate transparent ICOs from PNGs with online favicon genereators.
For example, if your favicon is reachable in:
http://example.com/favicon.ico
Then your PDF will show this favicon in the Acrobat plugin tab:
http://example.com/something/something.pdf
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…