PDF malware analysis — malicious · a2466b7c345b6bf0

MALICIOUS

PDF

6.0 KB Created: 2008-12-03 13:57:41 UTC

MD5: de5b0db9468990efd68f16b18d058b0e SHA-1: a7fbdbf9f7e914c552ab6123f4f875aba786a549 SHA-256: a2466b7c345b6bf04e210c24627a5af4f1a4ae712b8b851a363d5e4c1d4ef28a

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of an eval() call and String.fromCharCode suggests obfuscated code execution. A machine learning classifier also flagged this PDF as malicious with high confidence. The embedded JavaScript file, 'javascript_obj0006_000.js', is the primary indicator of malicious activity, likely downloading and executing a second-stage payload.

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` `e9e1d5d447119e49b93d87dc28f1120bd60e1751ffc15c39884b7c42ee7bd4b5`	pdf-javascript-stream	PDF /JS object 6 at offset 0xB4	9745 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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