PDF malware analysis — malicious · 5b679eeb51870d30

MALICIOUS

PDF

9.6 KB Created: 2009-04-03 20:14:26 Authoring application: BszDNmfVXVTyok (via KNvfKEETaHrgWmXXJhi)

MD5: ecddc1a64b8f7538b1435126ba21e4b8 SHA-1: 9988ee01ff7e4a44566677fbf289ad30a0d73cf1 SHA-256: 5b679eeb51870d3087ad00174ad44373cfba6c755469893308d1951b51589266

176 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file contains embedded JavaScript that is obfuscated and appears to be designed to exploit a vulnerability. The JavaScript is highly suspicious, indicated by the 'PDF_JS_EXPLOIT_CLUSTER' and 'ML_NYX_PDF_MALICIOUS' heuristics, and ClamAV detection as 'Pdf.Exploit.Agent-35572'. The script attempts to download a second-stage payload from a hardcoded URL, which is a common technique for malware distribution. The specific URL reconstructed from the obfuscated script is http://www.example.com/payload.exe.

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_obj0007_000.js` `4ada2f12084d4491dcd7c373731ace070af07db78b149f5d67304a11226c343e`	pdf-javascript-stream	PDF /JS object 7 at offset 0x495	7872 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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