PDF malware analysis — malicious · 5e3f7bfa8f7cf139

MALICIOUS

PDF

14.1 KB

MD5: 652857b6fa2d1041d2646b5dd1551c21 SHA-1: c303c6cfa8f898b9499621fd80050cb5e154e99c SHA-256: 5e3f7bfa8f7cf139ded930a9baa12caf72dde6ec56924b52a70069d69e9cd9d2

176 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is a PDF file that contains obfuscated JavaScript. Heuristics indicate the JavaScript is likely an exploit attempting to execute code. The ML classifier and ClamAV detection strongly suggest malicious intent. The JavaScript itself appears to be a standard MD5 hashing library, which is often used to obfuscate malicious code or URLs within exploits.

Machine Learning

Nyx PDF Classifier malicious score 0.9988

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: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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` `b3678b221a335c9f4472ddbeba7a3fea7a9c81a2901482f5c245e01775065bf9`	pdf-javascript-stream	PDF /JS object 6 at offset 0x19F	14320 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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