PDF malware analysis — malicious · 2cbb7c553016f4c8

MALICIOUS

PDF

292.8 KB

MD5: baedd97f3068d971793e77983804e40b SHA-1: c9003f4491f97e7b3246dbcb443885c6364592de SHA-256: 2cbb7c553016f4c889e2160806795156dc249b079ce7c427b6fb491fcc3d6914

76 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: Malicious File

The PDF file was flagged as malicious by an ML classifier and contains embedded JavaScript. The JavaScript stream, identified as 'javascript_obj0008_000.js', is heavily obfuscated and likely responsible for downloading and executing a second-stage payload. The presence of PDF-specific heuristics like ASCIIHexDecode with exploit indicators further supports a malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `15456133f46defedb43e7676b18ad2a4e4771a9cfd8fee2300410093784b8da2`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1CE	99672 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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