PDF malware analysis — malicious · 19515129db9612b3

MALICIOUS

PDF

28.2 KB Created: 2010-04-02 14:20:49 +08:00 Authoring application: Acrobat Web Capture 7.0

MD5: e4f108252a28411e189c8fd2602a9a51 SHA-1: f43f48f52f0ef87d6fa1a93efa96c5371e3cfad0 SHA-256: 19515129db9612b34b406db2a33dd52d29052509edd1a7041d89d3827f8a3b81

120 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains embedded JavaScript streams that are heavily obfuscated, indicating an attempt to hide malicious code. Heuristics indicate this JavaScript is part of an exploit cluster, likely designed to execute arbitrary code. The presence of two large JavaScript objects suggests a complex, multi-stage attack. Given the nature of PDF exploits, the initial access vector is likely spearphishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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.
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. (matched inside decoded stream)
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
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.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/xap/1.0/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/pdf/1.3/

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0047_001.js` `4f908145687ac96732e6642efc824b36c95987cb54c260ce96306031c20156e9`	pdf-javascript-stream	PDF /JS object 47 at offset 0x3ACB	25318 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0049_002.js` `d735ee5931cd200d629f264c1b3bba8569bbff69993c8dbe53e5c9fae2185a44`	pdf-javascript-stream	PDF /JS object 49 at offset 0x648A	25293 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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