PDF malware analysis — malicious · 129a7624001657d8

MALICIOUS

PDF

1.24 MB Created: 2010-07-29 10:23:43 Authoring application: Scribus 1.3.3.14 (via Scribus PDF Library 1.3.3.14)

MD5: 3d609bddbce459b03e0834b508fcf847 SHA-1: d44c9fb23ad048d8fc78ddae335acefdb56f9356 SHA-256: 129a7624001657d84933cd8fc76e93cb30c9bc5c1024a14d2ae0c603626396b8

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript streams that are heavily obfuscated. These scripts likely attempt to exploit a vulnerability within the PDF reader to download and execute a second-stage payload. The ML classifier and PDF JavaScript exploit heuristics strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9876

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` `ac69c6c3334f31508d41f264b6c96bf03dc0f3b9e99acd4047cc80fe19c3f90d`	pdf-javascript-stream	PDF /JS object 55 at offset 0x13DBAE	1782 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s).
`javascript_obj0055_002.js` `c26bae225f558de7a6e55ebd1eabf3545b0df67f05e817302bcb2d94fc2c79d8`	pdf-javascript-stream	PDF /JS object 55 at offset 0x13DBD1	3275 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s).

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