PDF malware analysis — malicious · 85ed44aceace0ff6

MALICIOUS

PDF

6.7 KB Created: 2009-11-17 23:22:12 Authoring application: Scribus 1.3.5svn (via Scribus PDF Library 1.3.5svn)

MD5: ded95ba1fe481ab665550012ff4e07ee SHA-1: 39bc385b2ea703c5c79ee0bee8f4d8630e54a050 SHA-256: 85ed44aceace0ff6aae94adc2fe6ac605277bd124f1df3e207469f41f8f981d9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1140 Deobfuscate/Decode Files or Information T1566.001 Spearphishing Attachment

The PDF file contains obfuscated JavaScript code that utilizes `unescape()` and `String.fromCharCode()` functions to decode a malicious payload. The ML classifier strongly indicates maliciousness, and the heuristics point to a JavaScript exploit cluster. The script's primary function appears to be deobfuscating and executing further malicious code, likely a second-stage payload.

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)
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_obj0016_001.js` `2adb93111f1fbd458c6010bb02c1421e04fd02f19948ba328ee51742db1ef868`	pdf-javascript-stream	PDF /JS object 16 at offset 0xC9A	12549 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

Open this report in the interactive analyzer, or submit your own file for analysis.