PDF malware analysis — malicious · 5f58ca9774f693c5

MALICIOUS

PDF

10.2 KB Created: 2009-02-19 14:45:49 -02:00 Authoring application: Writer (via OpenOffice.org 3.0)

MD5: 7025e743146c0efa3a7e4bfed8b485be SHA-1: d327f8bca004d46527396fc2c044ec9ba96a978f SHA-256: 5f58ca9774f693c5be9721d0d1ab4cb456b3d8b6ff5d6a3bc98aa421b79a2580

256 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript that utilizes eval() and String.fromCharCode, indicating an attempt to obfuscate malicious code. The critical PDF JavaScript exploit cluster heuristic and ClamAV detection of 'Pdf.Exploit.Agent-35541' strongly suggest this file is malicious. The embedded JavaScript is designed to download and execute a secondary payload, a common technique for initial compromise.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 8

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
ClamAV: Pdf.Exploit.Agent-35541 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35541
Launch action high PDF_LAUNCH

PDF contains a /Launch action with an unresolved or extension-less target — treat as potentially dangerous
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. (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_obj0027_000.js` `4b1d518b94b0f594814b2465ef29b1c634656249666cc02b4ce6dc3752e2b260`	pdf-javascript-stream	PDF /JS object 27 at offset 0x1D69	24541 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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