PDF malware analysis — malicious · 624812011f1e1dff

MALICIOUS

PDF

5.1 KB Created: 2009-02-13 04:13:07 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 7f325f3c19e9d5d39a1dc1a0a8b63a44 SHA-1: 6c24fcbb17512b088dd56efff11be9f52bf5ca60 SHA-256: 624812011f1e1dffbe571de54a999a3c345ef1233707723cdaff48e274a1e104

116 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript, identified by heuristics like PDF_JAVASCRIPT and PDF_JS_EXPLOIT_CLUSTER. The JavaScript code is heavily obfuscated using a custom RC4-like stream cipher and the `fromCharCode` method. The script's primary function appears to be downloading and executing a second-stage payload from a URL encoded within the script itself. The decoded URL is 'UFQ1UWYzc1E4MkUxdlR6b21sTU0wMjA2NjE2'. This indicates a typical downloader pattern, often associated with spearphishing attachments.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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.
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_000.js` `b15be844b95eee61daa7eb1829b435bfdacba623ba7cfe8fb04c1114efb455be`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3CE	5469 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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