PDF malware analysis — malicious · 130aca5ccc1ac3e1

MALICIOUS

PDF

76.8 KB Created: 2006-06-18 12:11:19 Authoring application: Image to PDF Converter, Build: Jul 14 2008 (via Image to PDF Converter (http://www.imagepdf.com))

MD5: 8f7ad69d43ef57239a9ff5ccb6ff4b0e SHA-1: dc732e9340bd42b29b34e4049902d10466086695 SHA-256: 130aca5ccc1ac3e15553acc9e8f184121538cbcbc3591731ec8d145e80a0963d

274 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file contains JavaScript that exploits CVE-2009-0658, a known vulnerability in Adobe Reader's JBIG2Decode filter. The script uses unescape() to decode shellcode, which is then likely used to download and execute a secondary payload. The presence of multiple benign Adobe and W3C URLs, along with the imagepdf.com domain, suggests a lure or distraction, but the core functionality is malicious exploitation.

Machine Learning

Nyx PDF Classifier malicious score 0.9989

Heuristics 11

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.
External URI info PDF_URI

PDF contains an external URL action
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.imagepdf.com/
- http://www.imagepdf.com
- http://www.dynaforms.com
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 7

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0052_000.js` `107329aa908106adfe3aac2e4d3189d5a61aaa3b4abeee89df7d6cfa5f7e9df4`	pdf-javascript-stream	PDF /JS object 52 at offset 0x12FB8	861 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`jbig2_00_off00000afa.bin` `c69d7c0227e5ef1e26a89c459ddf9d09a9faf1b918a56ae1e61eab7a234db840`	pdf-jbig2-stream	PDF JBIG2 stream at offset 0xAFA	6891 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.95, consistent with packed or encrypted content.
`jbig2_01_off00002a0c.bin` `13135e18100476acf64d12883ae147d8ce65873b370a6defb93431dadcc105a5`	pdf-jbig2-stream	PDF JBIG2 stream at offset 0x2A0C	13608 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.98, consistent with packed or encrypted content.
`jbig2_02_off00006364.bin` `dedfefe24558656a9350fd65eb2e76d46445da7fc98e71e8b9da1dea89224515`	pdf-jbig2-stream	PDF JBIG2 stream at offset 0x6364	12266 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.98, consistent with packed or encrypted content.
`jbig2_03_off00009781.bin` `7df82efccc2213d446a2ca88f1000d8de6a1f92d7388b1fa1d9bcdb7b233ceaf`	pdf-jbig2-stream	PDF JBIG2 stream at offset 0x9781	13472 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.98, consistent with packed or encrypted content.
`jbig2_04_off0000d055.bin` `8b9eee256bf34e2892fae9fec405f9339cc7e088f3630c5e25f0af2e5aa9cf57`	pdf-jbig2-stream	PDF JBIG2 stream at offset 0xD055	13894 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.98, consistent with packed or encrypted content.
`jbig2_05_off00010ace.bin` `141b31cb3bc5af7860119f0f1f911b088b18bc07d392e4d5b94040ebbe9bc961`	pdf-jbig2-stream	PDF JBIG2 stream at offset 0x10ACE	6796 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.95, consistent with packed or encrypted content.

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