PDF malware analysis — malicious · e6a8c0bff496a74c

MALICIOUS

PDF

17.4 KB Created: 2009-08-15 21:19:13 Authoring application: fXr4PD (via ZrxuPs)

MD5: c0cdcd5dbba3505699ff188819d9aaed SHA-1: fe278897ba6e5b9c573e26df08fdda3521d2ea9a SHA-256: e6a8c0bff496a74c83b34dac16c58e510bb3ee119719105d150b6a255d95fded

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file was flagged as malicious by a ClamAV signature (Js.Trojan.Obfus-48) and a machine learning classifier. Heuristics indicate the presence of embedded JavaScript, including the use of `eval()` and `String.fromCharCode()`, suggesting obfuscated code execution. The embedded JavaScript is likely responsible for downloading and executing a secondary payload, which is a common technique for malware delivery.

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` `383e7b23dc036f7fa1ed8e90f7be39c104cc87944c76ab41b8ca810c64cea74d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x23D	16531 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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