PDF malware analysis — malicious · 12a4af33179e6ad4

MALICIOUS

PDF

31.2 KB

MD5: b80b33e145f500b7e25379ce80108517 SHA-1: 15dcb4df5cf13e75039092ecd018fda95d3a8245 SHA-256: 12a4af33179e6ad4acc66766c4a9f273c60844f2bbaf9c61019f32ae4971b75b

196 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF sample contains embedded JavaScript that utilizes an eval() call to execute obfuscated code. This script is designed to load and execute a Flash object (TyPWoIJRMY.swf), which is a common technique for delivering secondary payloads. The presence of PDF JavaScript exploit cluster heuristics and ML classification strongly indicates malicious intent.

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.
RichMedia (Flash) high PDF_RICHMEDIA

PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`TyPWoIJRMY.swf` `767382813fc770c9716554c3266b22eee1636037ca964af05acf6ff66db4a27d`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x11A0	26993 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.98, consistent with packed or encrypted content.
`javascript_obj0006_000.js` `0ac05b86d2bc429519dba9ffa70655a012be96c628e9de1455b1a946c092d1f7`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF9	3415 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `f3c16234e78ff2f9064e1f0d21d9c757a28212eca0ef3e309d116c7cd378bc0a`	deobfuscated-js	split-join delimiter stripped JavaScript at offset 0xDB1	2085 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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