PDF malware analysis — malicious · 0cdbac7f4a3658f9

MALICIOUS

PDF

7.1 KB Created: 2009-11-12 18:17:06 Authoring application: Scribus 1.3.5svn (via Scribus PDF Library 1.3.5svn)

MD5: 50e3449526fbff2e1b88aa61418757a2 SHA-1: b51ff694ef077ce0b19b86be239382c6e0664daa SHA-256: 0cdbac7f4a3658f9d5ababddad868eb6278a77a29951d0b76b9497d134ad989b

174 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 utilizes `unescape()` and `String.fromCharCode()` for obfuscation, a common technique in exploit delivery. The script is designed to decode and execute a secondary payload, indicated by the `PDF_JS_EXPLOIT_CLUSTER` heuristic. While the exact nature of the second-stage payload is not fully discernible due to truncation, the overall pattern suggests an attempt to exploit a client vulnerability for code execution, likely delivered via spearphishing.

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.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
Suspicious extracted artifact medium 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.
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)

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `5da6113b61cf62ad16081fab7abaa1724a83c4184fd4a6a50e870513e59b1278`	pdf-javascript-stream	PDF /JS object 13 at offset 0xF03	13419 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 3 long hex-escaped blob(s).

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