PDF malware analysis — malicious · 89ab18f1162da896

MALICIOUS

PDF

16.9 KB Created: 2010-03-11 12:19:58 Authoring application: TP8JKa5Oo7npB8 (via MKDMRiYZF)

MD5: ed6ceb1b9c6c56ab133d725aa73f8e02 SHA-1: f1df9fc04e3a7137e80644b9c0772d3156887143 SHA-256: 89ab18f1162da896cb8d0a2d482e51d87f0c52231b8c7d9c3d7fad9c13fea9e7

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF document contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of a high severity PDF_EVAL firing suggests that the JavaScript is likely obfuscated and uses eval() to execute its payload. The ML classifier also strongly flagged this PDF as malicious. No document body text was available for analysis, but the script's execution is the primary indicator of malicious intent, likely to download and execute a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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` `073e501ab6a9fba98036c3aaf9f40d7523d3cdb1729f2087534c20b5c54483e2`	pdf-javascript-stream	PDF /JS object 7 at offset 0x241	16040 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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