PDF malware analysis — malicious · 19b819eb1ba746ad

MALICIOUS

PDF

9.6 KB Created: 2009-04-09 15:42:38 Authoring application: LInpIspnoNlgycF (via KyIbUGkunIxQueq)

MD5: 4424a7cb2d975a940d4d8c4ee4efcdd7 SHA-1: f0d547ed43bbdc20b2e140f4ead125726536dc69 SHA-256: 19b819eb1ba746ad0ad048e8201d3df07cc4c78792c853956c66e5be25e3c45b

116 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file contains obfuscated JavaScript that is designed to exploit a known vulnerability. The script attempts to download and execute a secondary payload from a hardcoded URL. The ML classifier strongly indicates maliciousness, and the presence of JavaScript exploit indicators further supports this assessment.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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.
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` `3416663427eb8f96e8cd2fd5ad581200565fc7f591ad68926cad5cb81a060e2d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x3C5	8095 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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