PDF malware analysis — malicious · 6dab98cc965aadf6

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: e3ae67eac03453fbf88449c4e9cda5d6 SHA-1: 7354ced9a32e598cad5b8e4f6374c2acfd85da98 SHA-256: 6dab98cc965aadf661ff6a46517a606c0ec3e51b46fad6b6d6277425977f4b6e

116 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 is heavily obfuscated. The script utilizes a custom RC4-like stream cipher to decrypt a second-stage payload, which is then likely executed. The presence of PDF JavaScript exploit cluster heuristics and ML classification strongly indicates malicious intent, likely to download and run further malware. The initial access vector is presumed to be Spearphishing Attachment.

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` `46144baae32d415de7d04d5a48fee2a2e1c34d19503c8fd1d71b280fcd0b6264`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3CE	5378 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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