Portable Document Format (PDF) is now ISO 32000-1:2008 based on the PDF Reference 1.7., an International Standard and a publication of the International Standards Organization (ISO). The document is managed by a democratically organized and open committee of subject matter experts through ISO’s Technical Committee TC 171, Administered by ANSI and AIIM.
The official document may be purchased from the ISO website: ISO 32000-1:2008 Document Management – Portable Document Format – Part 1:PDF 1.7
Because the PDF Reference is traditionally available at no cost, the ISO has graciously allowed Adobe Systems to provide and host an unofficial ISO 32000-1 document, available as a free download from Adobe Systems. The body text of the document is the same as the official ISO 32000-1 International Standard.