PDF malware analysis — malicious · 7c3b274809c8421e

MALICIOUS

PDF

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

MD5: 0a91d5095c0e9d94f5c4826f227bcdf3 SHA-1: 7f2a8e1174a03978ee266321606b8566640072f4 SHA-256: 7c3b274809c8421e761b53e26297f9d7f61c925908cbf07a8165ec505a234982

272 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains multiple embedded JavaScript streams that utilize unescape functions to decode and execute shellcode. This shellcode is designed to exploit a known vulnerability (CVE-2009-0658) in Adobe Reader, leading to arbitrary code execution. The presence of JBIG2 decoding with active content further supports the exploitation of this vulnerability.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 10

Adobe Reader JBIG2Decode generic heap-spray exploit critical CVE likely CVE_2009_0658_GENERIC_SPRAY

PDF combines JBIG2Decode image streams with JavaScript heap-spray or decoder scaffolding. This is likely CVE-2009-0658-family Adobe Reader JBIG2 exploitation, but it lacks the stricter Reader-9 version gate or decoded page-word shellcode fingerprint required by the exact rule.
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 6

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).
`stream_009_off00001c1f.bin` `6a71966cad617bfb05c2fc57e09517130f7abf80fb7d2cd8d6f9a72dd0ff8cc6`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1C1F	8958 bytes
`jbig2_00_off00008305.bin` `7c56ab6a59122d3bd1e0b245d11faccdfd5ad61037ff281edf10d89ba58303f3`	pdf-jbig2-stream	PDF JBIG2 stream at offset 0x8305	3739 bytes

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