PDF version 1.7 (and prior) supported. There are Adobe extensions to PDF 1.7 for Acrobat 9.
Product Family includes: Acrobat Standard 9 (Windows only), Acrobat Pro 9, Acrobat Pro Extended 9 (Windows only). 
Pro Extended Version includes Adobe Presenter and the features of Acrobat 3D.
Enable real-time collaboration of PDFs with synchronized document views and chat.
Improved Web Capture for capturing entire web pages or just some parts into PDF.
Integration with acrobat.com to enable storage and sharing of PDF files.
Personalize a PDF Portfolio with customizable templates for navigation and branding.
Compare and highlight the differences between two versions of a PDF document.
Insert FLV (Flash) or H.264 video for direct playback in Adobe Acrobat and Adobe Reader.
Convert a variety of video formats to FLV for playback in PDF.
Create PDF maps by importing geospatial files that retain metadata and coordinates.
Adobe Reader 9 drops support for Adobe Reader Extensions 5 and 6 which permit Adobe Reader client software to save changes to filled-in forms in PDFs. Adobe Reader Extensions 6.1 and newer are still supported. Legacy PDFs will still be viewable, however they will open with the warning "This document enables Reader capabilities that are no longer enabled in this Reader version."[11]
In March 2009, an update version 9.1 was released which addresses a number of customer workflow issues and a critical security vulnerability while providing more stability.
On March 24, 2009, Adobe Reader 9.1 released for Linux(X86) and Solaris(X86) users.
On May 13, 2009, Adobe Reader 9.1.1 was released for Windows, Mac, and Unix.
On June 9, 2009, update version 9.1.2 was released which addresses a number of critical security vulnerabilities.[12]
On July 31, 2009, update version 9.1.3 was released which addresses a number of critical security vulnerabilities.[13]
[edit] Internationalization and localization
[edit] Language availability
Adobe Acrobat is available in the following languages: Arabic, Chinese Simplified, Chinese Traditional, Czech, Danish, Dutch, English, Finnish, French, German, Greek, Hebrew, Hungarian, Italian, Japanese, Korean, Norwegian, Polish, Portuguese, Romanian, Russian, Spanish, Swedish, Turkish, Ukrainian. Arabic, Nepali, Hebrew and Greek versions available from WinSoft,[14] Adobe Systems' internationalization and localization partner. Adobe Reader is also available in Catalan since version 9.1.
[edit] Specific features for Arabic and Hebrew languages
The Arabic and Hebrew versions are specifically developed for these specific languages, which are normally written right-to-left. These versions come with special TouchUp properties to handle digits, ligatures option and paragraph direction in right-to-left Middle Eastern scripts such as Arabic, Hebrew, and Persian, as well as standard left-to-right Indian scripts such as Hindi, Sanskrit, and Gujarati. The Web Capture feature can convert single web pages or entire web sites into PDF files, while preserving the content's original text encoding. Acrobat can also copy Hebrew and Arabic text to the system clipboard in its original encoding; if the target application also supports the text encoding, then the text will appear in the correct script.
[edit] Security
From Version 3.02 onwards, Acrobat Reader (now Adobe Reader) has included support for JavaScript. This functionality allows the document creator to include code which executes when the document is read. While JavaScript is designed without direct access to the file system to make it "safe", vulnerabilities have been reported for abuses such as distributing malicious code through Acrobat.[15]
[edit] September 2006 warning
On September 13, 2006, David Kierznowski provided sample PDF files illustrating these vulnerabilities. Since at least version 6, JavaScript can be disabled using the preferences menu and embedded URLs that are launched are intercepted by a security warning dialog box to either allow or block the website from launching.[16]
[edit] February 2009 warning
On February 19, 2009, Adobe released a Security Bulletin announcing Javascript vulnerabilities. US-CERT recommended users change two default preferences in the program:[17]
- Disable JavaScript in Adobe Reader and Acrobat. Acrobat JavaScript can be disabled in the General preferences dialog (Edit, Preferences, JavaScript, and un-check "Enable Acrobat JavaScript").
- Disable the displaying of PDF documents in the web browser. This can be disabled in the General preferences dialog (Edit, Preferences, Internet, and un-check "Display PDF in browser").
For users of Internet Explorer, US-CERT recommended changing an additional default behavior:[17]
- Prevent Internet Explorer from automatically opening PDF documents (by editing a registry key in Microsoft Windows).
[edit] Performance
The application has been criticized for being slow to load and use.[18] Workaround solutions have been developed to speed up the software.[19] The application has been improved by Adobe, as the latest version of the software is indeed quicker to load; Adobe claims that Adobe Reader 7 users can "Open and save PDF files faster than ever" as version 7.0 launches "up to 50% faster than version 6.0".[20] This works by installing a QuickStart program which runs every time the computer is turned on (and then quits). While it is often stated that this preloads the program into memory, using up memory resources, all it actually does is open and close each individual program file, allowing virus checking to take place in advance of the program actually loading.[21] Note that this QuickStart program is for Adobe Reader/Acrobat 7.0+ only.
Many have also noted poor behavior in the Internet Explorer and Mozilla Firefox Acrobat plug-ins. The plug-ins do not support full asynchronous loading, thus causing browsers to appear to "lock up" until the document has been fully downloaded.
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