MAL-2026-6440

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## Source: amazon-inspector (81f8a194aa79844110dede95f5f8c798d05c04c08f1a4f5d8822124b17c65fa6) The package advertises plain math/formatter helpers but index.js contains a heavily obfuscated payload concealed inside the calculateTokenPrice function. The payload is hidden behind ~1500 leading tab characters of visual padding, then uses two seeded Fisher-Yates string-shuffler decoders and String.fromCharCode splicing to reconstruct the identifiers 'constructor', 'require', and 'module' at runtime. The code resolves Function via yLb[kqz] (a string-shuffled property lookup for 'constructor'), uses that Function constructor to build a decoder from one shuffled blob, decodes a second scrambled blob into JS source, and invokes that source via Function(...)(3004). It also assigns the CommonJS require and module bindings to globalThis (global[require]=require; global[module]=module), giving the decoded code access to any Node built-in (network, fs, child_process) regardless of how the package is imported. None of this behavior is documented in the README or exposed through the advertised API. The combination of multi-layer obfuscation, visual concealment via tab padding, dynamic eval of decoded literals, and forced global exposure of require/module is the canonical shape of a hidden remote-code-execution backdoor in an npm utility package — the decoded payload runs whenever calculateTokenPrice is called by a consumer.