PDF malware analysis — malicious · 2d31c48f5cea0f1a

MALICIOUS

PDF

75.3 KB Created: 2009-03-25 22:17:22 Authoring application: KhluvUSgnBRzw (via E16Pm)

MD5: 60b2fd6817d1483ddb2c3794063a77e9 SHA-1: ef295a95e5b20504c6cc4f354050fc80d49d3990 SHA-256: 2d31c48f5cea0f1a8a68044205b8e080be85173e003495f908c4823724dfec65

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream is heavily obfuscated, utilizing String.fromCharCode and eval() calls, as flagged by PDF_FROMCHARCODE and PDF_EVAL. The primary function of this script appears to be downloading and executing a secondary payload, as suggested by the suspicious extracted artifact 'javascript_obj0007_000.js'. The obfuscation and eval() usage point towards an attempt to evade static analysis and deliver malicious content.

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` `6f41147f554991f440f7d946861508433ec874d69c5d51b5cf62e116dfe2f4f5`	pdf-javascript-stream	PDF /JS object 7 at offset 0x240	75878 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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