MetaDefender Core Customer Snapshot


Upwork is a freelancing website that connects businesses with freelance talent for highly-skilled knowledge work such as web, mobile and software development and design. Through Upwork, businesses can connect with freelancers to work on projects from web and mobile app development to SEO, social media marketing, content writing, graphic design, admin help and thousands of other projects.

Customer Challenges

Upwork receives millions of files a day from clients and freelancers and needs to ensure that those files are free from threats to protect both their own systems and the systems of everyone using their platform. To protect against possible malicious file uploads, Upwork deployed OPSWAT MetaDefender for its multi-scanning technology, which was able to block most threats, especially known threats. However, sophisticated attacks were still getting through, as many as 3-4 malware attacks per week.

OPSWAT’s Solution

After prototyping a number of solutions, including sandboxes and other multi-scanners, Upwork selected OPSWAT's content disarm and reconstruction (CDR) technology, also supported by its MetaDefender platform, to prevent the more sophisticated attacks from getting through.

MetaDefender CDR, also known as data sanitization, breaks down a file (such as Microsoft Office, PDF and image files) into its component parts, and removes any potentially malicious elements, including macros, scripts, or embedded files. The file is then reconstructed with the remaining safe content. With CDR, even if a document contains an undetected threat, it is made harmless in the process.

Upwork has always been focused on providing a secure environment for its community of millions of users, so they can safely transfer files and collaborate. Upwork and OPSWAT’s mutual commitment to security reinforces our pledge to ensure all users can have the necessary protection to keep their home and business IT environments safe.

Teza Mukkavilli
Head of Security, Upwork

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See how Upwork prevented 100% of zero-day file attacks with MetaDefender CDR, compared to only 70% blocked by standard AV.


After implementing MetaDefender CDR, there have been no more reported instances of malware making it through. With MetaDefender CDR, Upwork was able to prevent 100% of zero-day file attacks with MetaDefender CDR, compared to only 70% blocked by standard AV.

In addition, Upwork has not encountered any usability issues with the sanitized, rebuilt files. MetaDefender enables Upwork to retain the original file in case something is lost during the sanitization process that is critical to the value of the file. However, since implementing the data sanitization functionality, no user of Upwork’s platform has requested access to the original file. This is a strong endorsement of MetaDefender’s ability to retain the usability of files throughout the data sanitization process.

Upwork further reports that the CDR solution comes with almost no maintenance or overhead once it's deployed, and with little to no impact on user experience. All files with active objects are sanitized; 75% of files are processed and ready in less than a second, and 99% within less than six seconds.

For more information about OPSWAT and the MetaDefender product line, please contact us.


OPSWAT is a global provider of cybersecurity solutions that protect organizations from content-based threats and ensure regulatory compliance. Since 2002, OPSWAT has been helping enterprises identify, detect, and remediate advanced security threats from data and network-connected devices. Trusted by more than 1,000 organizations worldwide, OPSWAT’s MetaDefender solutions prevent advanced security threats across multiple channels. With over 35+ anti-malware engines, more than 30 supported data sanitization file types, and over 300 technology partners, OPSWAT is a leader in content disarm and reconstruction (CDR) technology, vulnerability detection, multi-scanning, device compliance, and cloud access control. For more information on OPSWAT, visit