PDF malware analysis — malicious · 05cbe7cd3bceddbe

MALICIOUS

PDF

10.1 KB Created: 2009-04-24 00:49:46 Authoring application: rTWWPicQEHCCBGPcyATnXwFA (via lLdgqUapBVPOjR)

MD5: e01623ba4f96b7fbba61dff8465597e0 SHA-1: f5c295f0a29c84d14cc4d545bb010ad93517b809 SHA-256: 05cbe7cd3bceddbe7fe9ee3ed039ecca04cc59e3e5eb155aa78349b61aa5f8c1

176 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript that is heavily obfuscated, but heuristic analysis indicates it is designed to exploit a known PDF vulnerability. The script likely downloads and executes a secondary payload, as suggested by the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings. The presence of 'javascript_obj0009_000.js' and the ClamAV detection name 'Pdf.Exploit.Agent-35572' are key indicators.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

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-35572 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35572
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_obj0009_000.js` `c7f6b2e69761b5feffb717c27b848b178aa9e6c85f28a03e9f8f22517437c8e3`	pdf-javascript-stream	PDF /JS object 9 at offset 0x7D6	7493 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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