PDF malware analysis — malicious · 14d9330bbab40a48

MALICIOUS

PDF

163.3 KB Created: 2009-03-05 21:22:26 +08:00 Authoring application: Acrobat Web Capture 8.0

MD5: 78a9e26086f0af58dd00ec48a140f865 SHA-1: 850d30bcbabddef4fb942794f6d98aa067a07363 SHA-256: 14d9330bbab40a489495c22ddebee63b089e2238751acaccb6e73ac2e9f753a2

272 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF file that contains embedded JavaScript. Heuristics indicate a critical PDF JavaScript exploit cluster, specifically targeting CVE-2009-0658, an Adobe Reader JBIG2Decode heap-spray exploit. The JavaScript code appears to be designed to spray memory and execute shellcode, a common technique for downloading and running additional malicious payloads. The presence of multiple obfuscated JavaScript streams strongly suggests malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

Heuristics 10

Adobe Reader JBIG2Decode heap-spray exploit critical CVE likely CVE_2009_0658

PDF combines JBIG2Decode image streams with a Reader 9 JavaScript heap-spray stage. This is the in-the-wild Adobe Reader/Acrobat JBIG2Decode exploit shape associated with CVE-2009-0658.
JBIG2 + active content high CVE related PDF_JBIG2_ACTIVE_CONTENT

JBIG2Decode appears with JavaScript/XFA/RichMedia — a related indicator for JBIG2 parser-exploit families including CVE-2021-30860 and CVE-2009-0658, but not a unique CVE fingerprint.
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.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
JBIG2Decode filter medium PDF_JBIG2

JBIG2 image decoder present — historically used in zero-click exploits
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.
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 10

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0054_000.js` `76b9a9d595e071c01fab427db3229805067700ca8167c99a8d39a6f6869c3734`	pdf-javascript-stream	PDF /JS object 54 at offset 0x9495	867 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0056_001.js` `a286a724917c4ed12e23c56fdbe9b05a086df706402e840df93ca822a639bf8f`	pdf-javascript-stream	PDF /JS object 56 at offset 0xA650	867 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0058_002.js` `6300b36f22ef6578b0f03e4e9331a4dc1cfa3ef51cfced50c1ce2d725dd82351`	pdf-javascript-stream	PDF /JS object 58 at offset 0xB7B5	867 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0060_003.js` `9fdeb4cf92d3ba004fe834e1ec15e7554d02b14121596b2b2948628aa9003bc4`	pdf-javascript-stream	PDF /JS object 60 at offset 0xC848	868 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0062_004.js` `0a9d23151e9073a8ce6d92ab297ef25ffa9a4997c3ef7ce0ab8072f24b3d913b`	pdf-javascript-stream	PDF /JS object 62 at offset 0xD8DB	868 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0064_005.js` `eda1a66b85446d51354818baf9e701cdc2d3426a71f8bb35fcb677bb522646b5`	pdf-javascript-stream	PDF /JS object 64 at offset 0xE96D	868 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0066_006.js` `81adc8bd7014daa6355cf20ea01b14f79bca4b4c76f8c2fd674fb8103622f478`	pdf-javascript-stream	PDF /JS object 66 at offset 0xFA00	1845 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`javascript_obj0068_007.js` `458e954f8b259080881683abc6ca3cff365a406c2deb959633a401931e84049c`	pdf-javascript-stream	PDF /JS object 68 at offset 0x10AD8	1824 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`stream_009_off00001c1f.bin` `6a71966cad617bfb05c2fc57e09517130f7abf80fb7d2cd8d6f9a72dd0ff8cc6`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1C1F	8958 bytes
`jbig2_00_off00008305.bin` `1cfac334febaf34e66dcd07113ee4c1bf15b80680454fb6fffce751501c3d6ba`	pdf-jbig2-stream	PDF JBIG2 stream at offset 0x8305	3739 bytes

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