How can I save my Adobe Photoshop file as a PDF?
In short... Choose File > Save As, and then choose Photoshop PDF from the Format menu. You can select a Color option if you want to embed a color profile or use the profile specified with the Proof Setup command. You can also include layers, notes, spot color, or alpha channels. Click Save. For more advanced information, please refer to this excellent and informative article from Adobe.