PDF malware analysis — malicious · 18e8b55246c3ce21

MALICIOUS

PDF

16.6 KB Created: 2010-03-12 07:19:36 Authoring application: x3ipp (via e0LVCGJVjge)

MD5: 1a7a890ff8842a6322c24378378fb27b SHA-1: 67cd2cd3e8a9b86e9bc245fbaa9e42e8e24d29da SHA-256: 18e8b55246c3ce210b9f4717d7710431e712a8ed36b1472ee7fa43e55e55dc8c

156 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file contains embedded JavaScript that is heavily obfuscated using `String.fromCharCode` and `eval()` calls, indicating malicious intent. The ML classifier strongly flagged this PDF as malicious. The JavaScript is likely responsible for downloading and executing a secondary payload, a common technique for malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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` `1224319d6436f5731491a5d377bca2b82e5ce511ceabf006cd4e081d41dc2bfd`	pdf-javascript-stream	PDF /JS object 7 at offset 0x23D	15744 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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