PDF malware analysis — malicious · 145587457113c281

MALICIOUS

PDF

16.1 KB Created: 2009-10-30 04:06:01 Authoring application: GkangvYoknOEoQqqHpnQvi (via dagKkmMVnUlXfP)

MD5: b95f415d657d1c89d31ba70f4c74a537 SHA-1: 8abcf88d52fbd214bcf9349d2102f935e9324fd3 SHA-256: 145587457113c28167fe138703d274e31f12fa5e7021035736ebe9d38324c950

176 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains embedded JavaScript, flagged by multiple heuristics as an exploit cluster. The JavaScript is obfuscated using XOR and Base64 encoding, typical of droppers designed to download and execute further malicious content. The ClamAV detection name 'Pdf.Dropper.Agent-7231807-0' further supports its role as a downloader.

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.
ClamAV: Pdf.Dropper.Agent-7231807-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7231807-0
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.
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_obj0007_000.js` `1ace1776d2f336dab67dc36e7febdd24aed9d40b6d19fb60d56dad482fcd841e`	pdf-javascript-stream	PDF /JS object 7 at offset 0x525	14367 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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