Malicious PDF — malware analysis report

Static analysis result for SHA-256 e53cbefcf641e29d…

MALICIOUS

PDF

194.1 KB Created: 2009-05-14 12:40:13 +08:00 Authoring application: PScript5.dll Version 5.2.2 (via Acrobat Distiller 7.0 (Windows))
MD5: 458b39c9a725275bf97cde3aed7a631e SHA-1: 1a25a7437ca26e9a009a102e68414a3085b7687c SHA-256: e53cbefcf641e29d65d8de4bdf4a5e9dc2123a23789fe5774d4305de08ef8fc5
238 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.001 Malicious Link T1204.002 Malicious File

This PDF file contains embedded JavaScript that utilizes a heap-spray technique targeting the CVE-2009-0658 vulnerability in Adobe Reader. The presence of 'Pdf.Dropper.Agent-7316781-0' and the critical heuristic firings strongly indicate that this is a dropper designed to download and execute further malicious content. The exploit targets a specific vulnerability, suggesting a delivery mechanism rather than a self-contained exploit.

Heuristics 9

  • 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.
  • ClamAV: Pdf.Dropper.Agent-7316781-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7316781-0
  • 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.
  • 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/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0021_000.js
c108b22775026c92a327460eadf0bbd611e7bcedb0dd8e6af00e3568acd404bf		 pdf-javascript-stream PDF /JS object 21 at offset 0x37E 540 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
jbig2_00_off0000065a.bin
3bd256757afb9dd52b840e247c50dc35516bac93caceba907cc298bfba07ac75		 pdf-jbig2-stream PDF JBIG2 stream at offset 0x65A 3739 bytes

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