PDF malware analysis — malicious · b930e69aed4e0916

MALICIOUS

PDF

9.8 KB Created: 2009-10-04 13:45:55 Authoring application: Scribus 1.3.5svn (via Scribus PDF Library 1.3.5svn)

MD5: 678919b59f08bc6d01d7ed69f47406a9 SHA-1: 520a32894c4f5fc46ca5321370a8e6a2dfae9b93 SHA-256: b930e69aed4e0916b1d7a08c34690876ffc58a920420961ecb6d7e94e799f8d5

216 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains embedded JavaScript that is heavily obfuscated using `unescape()` and `String.fromCharCode()`. This script is designed to exploit known PDF vulnerabilities, as indicated by the 'PDF_JS_EXPLOIT_CLUSTER' heuristic. The primary function of the script appears to be downloading and executing a second-stage payload, as suggested by the ClamAV detection name 'Pdf.Dropper.Agent-7216895-0'. The use of JavaScript and exploit cluster heuristics strongly points to a malicious dropper.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

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.Dropper.Agent-7216895-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7216895-0
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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_obj0013_001.js` `4442b7422c2ff6fb6ccf6fd5277e99a3988b72adae5ae74d7fb4f2d236c9534e`	pdf-javascript-stream	PDF /JS object 13 at offset 0x1917	10961 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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