Malicious PDF — malware analysis report

Static analysis result for SHA-256 787163df628ea11b…

MALICIOUS

PDF

4.5 KB Created: 2008-09-24 19:47:56 Authoring application: Adobe
MD5: 10cf7a0f37a3e4e6d8aab0b0de09dced SHA-1: 8d3d30f73e7940498fcebc426c7856ff1bc4933f SHA-256: 787163df628ea11b9edd5da0cc5b20961c2a4f04b97bded8caeb170ee6738186
450 Risk Score

Malware Insights

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

The PDF file contains JavaScript that exploits multiple known Adobe Reader vulnerabilities, including CVE-2007-5659, CVE-2009-4324, and CVE-2009-0927. The deobfuscated JavaScript indicates that it attempts to download a second-stage payload from the URLs http://westnorths.cn//load.php?spl=pdf_new and http://westnorths.cn//load.php?spl=pdf_pack. This functionality is consistent with a multi-stage exploit kit designed to compromise vulnerable systems.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 11

  • media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324
    PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (identified after JavaScript deobfuscation)
  • Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927
    PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (identified after JavaScript deobfuscation)
  • Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659
    PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
  • Pidief-style multi-CVE JavaScript dispatcher critical CVE likely PDF_PIDIEF_MULTI_CVE_DISPATCH
    A single JavaScript body branches on app.viewerVersion and invokes two or more of the canonical Reader sinks (Collab.collectEmailInfo, Collab.getIcon, util.printf with a field-width format string). This is the 2009-2010 Pidief.J multi-exploit landing template: a per-version dispatcher that fires the matching CVE chain for whichever Reader version opens the file.
  • Multi-CVE Adobe Reader JavaScript exploit kit critical PDF_ADOBE_READER_MULTI_CVE_JS_KIT
    One recovered JavaScript stage contains multiple version-gated Adobe Reader exploit branches. This is stronger evidence than independent API keywords: the PDF is selecting old Reader vulnerabilities by viewer version and running heap-sprayed Acrobat JavaScript exploit paths.
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • PDF JavaScript shellcode contains an embedded download URL high PDF_JS_SHELLCODE_DOWNLOAD_URL
    Decoded PDF JavaScript shellcode contains a hardcoded http(s) URL stored as little-endian %uXXXX Unicode escapes. Reader exploit shellcode embeds the second-stage fetch URL this way and pulls it down with a urlmon/URLDownloadToFile-style download-and-execute (commodity downloader behaviour rather than a specific Acrobat CVE).
  • 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://westnorths.cn//load.php?spl=pdf_new
    • http://westnorths.cn//load.php?spl=pdf_pack

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0006_000.js
0dea183f6db22d652a1c5c18117cee445aa7c1bfa97952489765d30c303a8b06		 pdf-javascript-stream PDF /JS object 6 at offset 0xC2A 186 bytes
javascript_obj0016_001.js
3ee9bd46e93d789ccef9af987e22e26a725991a42d18692e9bdb32170224bf10		 pdf-javascript-stream PDF /JS object 16 at offset 0xD07 492 bytes
javascript_obj0026_002.js
f34fbb38bb6d387d3b849404d822464cfcba96519d8bef3d4d359bde169241a9		 pdf-javascript-stream PDF /JS object 26 at offset 0xE8C 140 bytes
legacy_pdfkit_stage_000.js
dbc8ad90611d1526d3aca776d7afaeaa60622fb3a47e8d7a7094a3cf9317f49f		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0x1E7 6376 bytes
Detection
ClamAV: Js.Exploit.Shellcode-18
Obfuscation or payload: likely
Carved artifact contains 12 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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