PDF malware analysis — malicious · a0cdf8e440ab4f63

MALICIOUS

PDF

5.8 KB Created: 2008-12-17 23:30:58 UTC

MD5: b7b384d5697c41ecd3bed839098440f7 SHA-1: c81e1ae8501155aa954b0fdb588c328ed2acabb3 SHA-256: a0cdf8e440ab4f6300853de5c4c62da8492fb6e46df9b14cbd88200bccf88e7d

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL'. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript stream, named 'javascript_obj0006_000.js', is likely responsible for executing malicious code, potentially downloading a second-stage payload. The obfuscated nature of the JavaScript and the lack of readable document body text prevent a more specific analysis of the payload's intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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_obj0006_000.js` `e0bf604573f843f0ae1e8716f71c1612bf7764fe9ad2ab2efd2cc3424b23fdb8`	pdf-javascript-stream	PDF /JS object 6 at offset 0xB5	12308 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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