PDF malware analysis — malicious · 77802584390a0191

MALICIOUS

PDF

6.0 KB Created: 2008-12-03 13:57:41 UTC

MD5: f964b87ad616f80c901bb3e1a185b110 SHA-1: 0963ef0154d6b9fed6f00f7042224a4a23504faa SHA-256: 77802584390a01914b367195c20a3f2119ca572b0714d1cff06e8c1d09e4d0f6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript that is heavily obfuscated. This script utilizes `eval()` and `String.fromCharCode()` to decode and execute further malicious code, indicating an attempt to exploit vulnerabilities within the PDF reader. The ML classifier strongly flags this PDF as malicious, supporting the conclusion that it's designed to deliver a payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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_obj0006_000.js` `4e38c85ca21eabee380d19ec0aa54ac4375c923a2d32b34a77c0a3d958898c59`	pdf-javascript-stream	PDF /JS object 6 at offset 0xB4	9742 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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