Starting with PDF 1.3, PDF files can contain file attachments, i.e., arbitrary files that a reader can extract, just like attachments to an e-mail message. The attachfile package brings this functionality to pdfLaTeX and provides some additional features such as the ability to use arbitrary LaTeX code for the file icon. Settings can be made either globally or on a per-attachment basis. attachfile makes it easy to attach files and customize their appearance in the enclosing document.