PDF malware analysis — malicious · 7c9c7db7fbb87483

MALICIOUS

PDF

2.7 KB

MD5: 226581d3e8d1c66090780b4ec49e642c SHA-1: d32f28163727c41ba46ec79a7452f5d571d9488f SHA-256: 7c9c7db7fbb874835e9617b3b878b8bec16ba6d7198056923d88d5b1e9907f6f

216 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains obfuscated JavaScript that utilizes `eval()` and `String.fromCharCode()` functions, indicating an attempt to execute arbitrary code. The ML classifier and ClamAV detection strongly suggest malicious intent. The JavaScript likely decodes and executes a second-stage payload, a common technique for exploiting PDF vulnerabilities.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

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.Exploit.Agent-13669 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-13669
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `0ce0766492770bfae96f88212f963a05a78e85652a4509d6615135f5797a9edb`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x197	2597 bytes
`javascript_obj111712_001.js` `7704a071024a6d9189b8ddc2f9ed2cf69f39ef0498e56e11d799542a52426212`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x8DD	510 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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