What does the pdfjs-dist-v5 malware do?

The package pdfjs-dist-v5 was found to contain malicious code. The OpenSSF Package Analysis project identified 'pdfjs-dist-v5' @ 100.25.0 (npm) as malicious. It is considered malicious because: - The package communicates with a domain associated with malicious activity. - The package executes one or more commands associated with malicious behavior.

Which versions of pdfjs-dist-v5 are malicious?

The following npm versions of pdfjs-dist-v5 are flagged malicious: 100.25.0. Treat any of these as compromised.

How do I remediate pdfjs-dist-v5 if I installed it?

Remove pdfjs-dist-v5 from your project and lockfile, then assume any secrets accessible to the build or runtime were exposed: rotate API keys, tokens, and credentials, and audit for unexpected outbound activity or persistence.

I already installed pdfjs-dist-v5 — how do I know if it already compromised me?

If pdfjs-dist-v5 was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.

How do I find pdfjs-dist-v5 across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for pdfjs-dist-v5 (version 100.25.0).

Malicious package

pdfjs-dist-v5npm

Advisory published Mar 3, 2026Updated Mar 8, 2026

pdfjs-dist-v5 is a confirmed malicious npm package (MAL-2026-1216) that executes malicious code on install (malicious version 100.25.0). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in pdfjs-dist-v5 (npm)

MAL-2026-1216

Immediate action

Remove the package, then rotate any secrets the build/runtime could reach.

npm uninstall pdfjs-dist-v5

What this malware does

The package pdfjs-dist-v5 was found to contain malicious code.

The OpenSSF Package Analysis project identified 'pdfjs-dist-v5' @ 100.25.0 (npm) as malicious.

It is considered malicious because:

The package communicates with a domain associated with malicious activity.
The package executes one or more commands associated with malicious behavior.

Malicious versions

1 flagged

100.25.0

Indicators of compromise (SHA-256)

ea3eea654406297d9c58cb235af1e0ff5095edde635d85444f41f9189cd2e88f

e5827ccd19d073818da31059d76a725b171d1fc793a4f2591ed0118a35b46c35

Detection & response playbook

Malicious package

Find it
Search your lockfiles and build artifacts for pdfjs-dist-v5 (version 100.25.0).
If you installed it — respond
Remove pdfjs-dist-v5 from your project and lockfile, then assume any secrets accessible to the build or runtime were exposed: rotate API keys, tokens, and credentials, and audit for unexpected outbound activity or persistence.
Did it already run?
If pdfjs-dist-v5 was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.

Frequently asked questions

No. pdfjs-dist-v5 on npm has been identified as a malicious package (version 100.25.0 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Credits

Amazon Inspector · finder
OpenSSF: Package Analysis · finder

Detect & block this

O3 blocks pdfjs-dist-v5-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the malicious outbound activity and severs the channel.

Malware detection Runtime egress monitoring

Explore

All malware advisories How O3 detects malware Vulnerability database