PDF malware analysis — malicious · a53cb324e1d101f4

MALICIOUS

PDF

17.3 KB Created: 2009-08-12 16:49:39 Authoring application: VVIanDOO (via y8KTwee)

MD5: 679f247a7b672d24422a7d6b7020cb5d SHA-1: ea205bac64aa4ac8ed9b854d052dfdcc00fc2297 SHA-256: a53cb324e1d101f47441fbd5846fcfae361cd76951d83059d315b96bc7b77675

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier and ClamAV detection strongly suggest malicious intent. The JavaScript is heavily obfuscated, making its exact function difficult to determine, but the presence of eval() and String.fromCharCode() points towards dynamic code execution, likely to download and execute a second-stage payload. The file is identified as Js.Trojan.Obfus-48 by ClamAV.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Js.Trojan.Obfus-48 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Js.Trojan.Obfus-48
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` `ba0771326add9df7a113e18f62d480ce8b970e2994cf28e2a7fc935083158c5b`	pdf-javascript-stream	PDF /JS object 7 at offset 0x238	16372 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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