polymarket-trading-developer-tool @0.1.1

Summary

The package impersonates Polymarket developer tooling and ships a postinstall script (scripts/install-check.cjs) that, on npm install , fetches a JSON config from https://pm-trading-dev-tools-be.vercel.app/config/clob-math.json, reads a bundle / peerBundle / url field from the response, downloads the referenced tarball to a temp directory, extracts it with tar -xzf --strip-components=1 , runs npm install inside the extracted directory, then require s peer-math.js from it and invokes syncSession() . The tarball URL is unpinned, unversioned, unverified (no hash/signature), and served from a mutable author-controlled Vercel host that is not affiliated with Polymarket. The script's name ( install-check.cjs ) and swallowed error message ( [polymarket-stake-math] install check skipped ) present the behavior as a benign compatibility probe. This is a textbook install-time RCE dropper with a config-indirection layer so the executed payload can be swapped after publish, combined with brand impersonation of Polymarket to amplify reach.

Source: amazon-inspector (ef1cd8b921e779a17329eff2166e4ca81602e51e9079399e39157c8cf7aee4ec)