PDF malware analysis — malicious · 637d89404b3fb036

MALICIOUS

PDF

1.25 MB Created: 2010-07-29 12:41:25 Authoring application: Scribus 1.3.3.14 (via Scribus PDF Library 1.3.3.14)

MD5: 44d9ac064b81a9c12516941ee21c9765 SHA-1: 3287effd82d50f4b88805f674888b7f7709efe20 SHA-256: 637d89404b3fb0366df274bd7236b946925741fc70a959fa1664092d5fd405f4

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 a potential exploit cluster. The JavaScript code itself appears to be heavily obfuscated or repetitive, making its exact function difficult to determine, but it is highly likely intended to download and execute a second-stage payload. The presence of JavaScript actions and exploit signals points towards a malicious PDF designed for initial compromise.

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` `23d2ff45d03f19b7ca2902e111b04bd7588cb1908ebbe9e993e95152d80b0e37`	pdf-javascript-stream	PDF /JS object 55 at offset 0x13DBAE	10962 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0055_002.js` `e3401a33d0d27826d17e609e4d083a05b8a2ff9cddd3b96702f87820e41431a5`	pdf-javascript-stream	PDF /JS object 55 at offset 0x13DBD2	12455 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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