PDF malware analysis — malicious · add9a5cbcea82e67

MALICIOUS

PDF

12.8 KB Created: 2009-02-19 14:45:49 -02:00 Authoring application: Writer (via OpenOffice.org 3.0)

MD5: a6c0fb28ab490fa76eeb9c3d4b58dac7 SHA-1: 3d0d4a9e9919b83033d778ef13641d282ae2c7e2 SHA-256: add9a5cbcea82e670848fed1ca88c8db6d06ec0f966b637ff8e22fa0affe96cf

136 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly indicates maliciousness. The JavaScript stream, identified as javascript_obj0025_000.js, is likely responsible for executing malicious code, potentially downloading further payloads. The presence of PDF_LAUNCH and PDF_EVAL heuristics further supports the execution of arbitrary code.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 6

Launch action high PDF_LAUNCH

PDF contains a /Launch action with an unresolved or extension-less target — treat as potentially dangerous
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_obj0025_000.js` `47f569527949a05aab5ae17bfe358d7348dd2fc86a3617268c5dda6d883be137`	pdf-javascript-stream	PDF /JS object 25 at offset 0x21AD	16470 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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