PDF malware analysis — malicious · 14f1c86f86237d1b

MALICIOUS

PDF

1.25 MB Created: 2010-07-29 12:36:54 Authoring application: Scribus 1.3.3.14 (via Scribus PDF Library 1.3.3.14)

MD5: ba65c52b03b715badaa33b4fa853b287 SHA-1: 11458f170dce506da7d3699484b9558260d78a37 SHA-256: 14f1c86f86237d1b74489b15c2e293f7a707fdecb370a719d7b55e5a7336488c

118 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 streams, identified by heuristics as an exploit cluster. The JavaScript code, though heavily obfuscated and repetitive with placeholder function definitions, is indicative of a downloader or exploit execution mechanism. The presence of ML_NYX_PDF_MALICIOUS and PDF_JS_EXPLOIT_CLUSTER firings strongly suggests malicious intent, likely to download and execute a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9850

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.
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://www.monotype.comMonotype
- http://ocsp.verisign.com/ocsp/status0
- https://www.verisign.com/rpa0
- http://www.monotype.com/html/mtname/ms_timesnewroman.htmlhttp://www.monotype.com/html/mtname/ms_welcome.htmlhttp://www.monotype.com/html/type/license.html
- https://www.verisign.com/rpa
- http://crl.microsoft.com/pki/crl/products/CodeSignPCA.crl0
- http://www.microsoft.com/typography
- http://www.iec.ch

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0055_001.js` `d7e64eb2ae0ec4ce0da262b6a8b2fb10f91914a02ce2bbae8616d47787c13ab0`	pdf-javascript-stream	PDF /JS object 55 at offset 0x13DBAE	10904 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0055_002.js` `c711aeb280d2d01ccacb8cca4c7d56cf367811689ea9018ef9bd0c01bdedce00`	pdf-javascript-stream	PDF /JS object 55 at offset 0x13DBD2	12397 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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