PDF malware analysis — malicious · 5d16ec6caa18e40b

MALICIOUS

PDF

75.7 KB Created: 2010-03-17 05:18:33 Authoring application: zAdrwClftyfeY3 (via eZHqVvWodzDN)

MD5: dac3bea3a780ec1330d8bd968fdd2984 SHA-1: 4366e0cb3d9a892af1eea4c1d045192e0c16e8e4 SHA-256: 5d16ec6caa18e40bf7bcf528885f381ccecc92a655f72b3d674d36ccd72a3170

156 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 utilizes `eval()` and `String.fromCharCode()`, indicating an attempt to obfuscate malicious code. The critical PDF JavaScript exploit cluster heuristic confirms this, suggesting the script is designed to exploit a vulnerability and execute a payload. The ML classifier strongly flags this PDF as malicious. No specific family could be identified, but the techniques used are common for PDF-based malware delivery.

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.
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` `4318a9f6243cea2bbabdb37a542dc0b2009e0efbfc0174e6fad3a0220e59d1ba`	pdf-javascript-stream	PDF /JS object 7 at offset 0x240	76239 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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