MAL-2026-16310 Malicious code in npx-test-ma980 (npm)

package.json declares a bin entry whose key contains shell metacharacters and a chained command: "tool & calc.exe": "./run.js". On Windows, npm's bin shim/symlink generation and later invocation via npm install -g or npx can interpret the & in the bin key as a command separator, causing calc.exe to execute as an unintended side effect of installing or linking the package. The shipped run.js is a trivial console.log("hello") and payload.json is empty, so the crafted bin key is the entire attack surface — a proof-of-concept exploit of npm bin-name handling that yields arbitrary command execution on the installer's host.