PDF malware analysis — malicious · b9134536ae8ca1a2

MALICIOUS

PDF

15.2 KB Created: 2009-10-13 19:46:29 Authoring application: PDF Library 7.9.7 (via PDF Library 6.4.1)

MD5: ee5baa5d796da7fc5d6b28f0cf5d06f9 SHA-1: 8462c8d0b5235510479e4f2262aae043775d1005 SHA-256: b9134536ae8ca1a25a75039ace1e78e03dce49e670749f8a8dfd03e16e8b4875

116 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript with high-confidence indicators of maliciousness, including eval() calls and String.fromCharCode usage, suggesting obfuscated code execution. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves leveraging JavaScript to likely download and execute a secondary payload, as indicated by the presence of an embedded JavaScript file. The obfuscation and use of eval() make it difficult to determine the exact payload or destination without further dynamic analysis.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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_obj0007_000.js` `8cfb8034e819e16a9033dbf26cb1437d7881671364c126092b5846bc469fdbf3`	pdf-javascript-stream	PDF /JS object 7 at offset 0x268	162803 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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