PDF malware analysis — malicious · f298b0f146e485b5

MALICIOUS

PDF

76.6 KB Created: 2010-03-17 08:18:32 Authoring application: bLy6CvJ (via k9X5T6)

MD5: dc76e876c52558bd6667b29a1a888d90 SHA-1: 1ead2b9b3bbb81712f2995f8b6033c634cb14c0a SHA-256: f298b0f146e485b53bc8260d56d18110a0b4fbbfb4b69229c048c2db849f8c65

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream is obfuscated and uses eval() calls, suggesting malicious intent. The ML classifier strongly flags this PDF as malicious. The primary function of the embedded JavaScript appears to be downloading and executing a secondary payload, as evidenced by the obfuscation and eval usage. No specific family could be identified.

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.
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_obj0007_000.js` `e8ae30b871df41fec57a003e9e82f3e02c0f9693129a7ef0f751262d75fed33a`	pdf-javascript-stream	PDF /JS object 7 at offset 0x234	77240 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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