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Adobe Acrobat 5.0.5 Security, Accessibility, and Forms patch - English

An update to Adobeᆴ Acrobatᆴ 5.0.5 is available. The Acrobat 5.0.5 Security, Accessibility, and Forms patch fixes a vulnerability in the full version of Adobe Acrobat 5.0 software that has the potential to execute arbitrary code from a malicious PDF document. This vulnerability does not affect any version of the free Adobe Acrobat Readerᆴ software and has been corrected in Acrobat 6.0. While a known virus is demonstrating this vulnerability, there are no reports of this virus or any variants adversely affecting customers.

This patch also addresses known issues that were corrected in this earlier Acrobat 5.0.5 patch:

http://www.adobe.com/support/downloads/detail.jsp?ftpID=1438

As a precaution, Adobe is working with anti-virus software vendors to protect customers against the potential for malicious variants. For more information, go to:

McAfee: http://vil.nai.com/vil/content/v_100269.htm

or:

Symantec: http://securityresponse.symantec.com/avcenter/venc/data/w32.yourde.html

VIRUS VULNERABILITY
Due to a vulnerability in the JavaScript parsing engine, a malicious PDF document can instruct Acrobat to write code into the userメs Plug-ins folder. Any file in the userメs Plug-ins folder that is developed to the Acrobat plug-in specification will automatically install and run when a user launches Acrobat.

The currently known virus exploiting this vulnerability demonstrates that malicious code can further replicate itself within other PDF documents used on an infected system. Only documents that are opened and explicitly saved in Acrobat become infected. Documents that are simply opened and viewed are not infected. PDF documents that are newly generated, even on an infected system, will not create a malicious PDF file for further replication.

INDICATIONS OF INFECTION
The currently known virus affects the Windowsᆴ platform only. Users can open their Plug-ins folder:

\Program Files\Adobe\Acrobat 5.0\Acrobat\Plug_ins

and look for suspicious plug-ins that do not ship with the product and were not explicitly installed with the permission of the user.

The only known virus exploits Windows systems by adding a file titled DEATH.API to the Plug-ins folder and EVIL.FDF to the C:\ directory on an infected machine.

METHOD OF INFECTION
A user receives and opens a malicious PDF file from an infected user. Replication occurs if an infected user subsequently opens and explicitly resaves a PDF document in the full version of Acrobat.

REMOVAL AND MITIGATION
The first line of defense is to keep anti-virus software up to date to automatically scan and repair infected PDF files. For more information on virus updates, go to:

McAfee: http://vil.nai.com/vil/content/v_100269.htm

or:

Symantec: http://securityresponse.symantec.com/avcenter/venc/data/w32.yourde.html

Users can further protect themselves from this vulnerability and prevent infection by doing one of the following:

ユ Upgrading to Adobe Acrobat 6.0
ユ Installing the Acrobat 5.0.5 Security, Accessibility, and Forms patch
ユ Restricting access to the plug-ins folder through administrative controls

File Information

Product Acrobat
Version 5.0.5
Platform Windows
File Name A507AFP.exe
File Size 1.8MB
Proceed to Download


System requirements

ユ Intelᆴ Pentiumᆴ processor
ユ Microsoftᆴ Windows 95 OSR 2.0, Windows 98, Windows Millennium Edition, Windows NTᆴ 4.0* with Service Pack 5 or 6, Windows 2000, or Windows XP
ユ 32MB of RAM (64MB recommended)
ユ 120MB of available hard-disk space
ユ Additional 30MB of hard-disk space for Asian fonts (optional)
ユ CD-ROM drive

* Internet Explorer 4.0.1, 5.0, or 5.5 required for Windows NT users

Installation Instructions

After downloading a ".exe" file in Windows, double-click on the ".exe" file to access the file's contents.

Need help with downloading? See our Downloading Help documents.

To install the patch, you must have Acrobat 5.0.5 on your machine. If you do not have Acrobat 5.0.5, download and install the Acrobat 5.0.5 update before installing the Security, Accessibility and Forms patch. To find out which version of Acrobat you currently have, choose Help > About Adobe Acrobat. The version number appears in the upper left corner, next to the Adobe logo.

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