Malicious PDF — malware analysis report

Static analysis result for SHA-256 738543114ace9d77…

MALICIOUS

PDF

30.9 KB Created: 2009-03-13 16:50:38 +08:00 Authoring application: Acrobat Web Capture 8.0
MD5: 933912d26eeef9d3c220679e1cc4f113 SHA-1: fa33957309ca38a185b75a723d5b9c6e103d1eac SHA-256: 738543114ace9d774ca2919fb976527c7dd1205fac5d6c27c57e54317616a5dc
332 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file contains JavaScript that leverages the CVE-2009-0658 exploit, targeting a heap-spray vulnerability in Adobe Reader's JBIG2Decode filter. The script attempts to download and execute a secondary payload, indicated by the use of unescape() and the cluster of exploit-related heuristics. The primary goal is to achieve arbitrary code execution on the victim's machine.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 11

  • 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.
  • ClamAV: Pdf.Exploit.Agent-30054 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-30054
  • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0027_000.js
601a3b11ab588966521fa37855104816220a35545c0981dc62d7cc83c12aa181		 pdf-javascript-stream PDF /JS object 27 at offset 0x6BCC 904 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
stream_001_off00002374.bin
6a71966cad617bfb05c2fc57e09517130f7abf80fb7d2cd8d6f9a72dd0ff8cc6		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2374 8958 bytes
jbig2_00_off000055da.bin
ce571f001b9594bfac188b3d00f1d4846834b1081072369ad1453852a6a64310		 pdf-jbig2-stream PDF JBIG2 stream at offset 0x55DA 4945 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.89, consistent with packed or encrypted content.

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