PDF malware analysis — malicious · 6dd4887cfd513141

MALICIOUS

PDF

9.2 KB Created: 2010-27-95 46:76:00 Authoring application: Above Alive (via Alive Alive)

MD5: 96096a16287caa6b01b2e2668e9f1d5d SHA-1: a7e7f63bb60333dc8659a152cc3f2ea54b952d24 SHA-256: 6dd4887cfd513141fc4f66d36ff0224e254052a0b73c564dfa08316b71a27f5e

116 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript that is heavily obfuscated and utilizes String.fromCharCode, indicating an attempt to hide malicious code. The critical heuristic 'PDF_JS_EXPLOIT_CLUSTER' strongly suggests this JavaScript is designed to exploit a vulnerability within the PDF reader. The primary function of this script is likely to download and execute a second-stage payload, although the exact URL or mechanism is obscured.

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_002.js` `560aa13df0455c860a47848f8008f6cff394b8dc05786c2c7c916f44c55eb825`	pdf-javascript-stream	PDF /JS object 13 at offset 0x389	55210 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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