Malicious PDF — malware analysis report

Static analysis result for SHA-256 838cfbd688326df9…

MALICIOUS

PDF

60.6 KB Created: 2012-07-05 17:07:19 +09:00 Authoring application: Microsoft® Office Word 2007
MD5: 74ba430de3b56778414ea72351683b2f SHA-1: 764fe63b04c98d92e0c0c9ebb57e75a8d74aab4e SHA-256: 838cfbd688326df95cb6ec69a2f8819ced85fbc8ef192b336a2d7ae57fe05c73
328 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File Execution: Malicious File T1059.003 Command and Scripting Interpreter: Windows Command Shell T1105 Ingress Tool Transfer

The PDF file contains embedded JavaScript and a launch action that executes cmd.exe. This action is designed to exploit CVE-2010-1240 to download and execute an embedded PE payload. The embedded executable payload is decompressed from a PDF stream. The specific command executed is 'cmd.exe /Q /C %HOMEDRIVE%&cd %HOMEPATH%&(if exist "Desktop\hello.pdf" (cd "Desktop"', which suggests an attempt to stage further execution or download additional malicious content.

Heuristics 9

  • Adobe Reader Launch action command execution critical CVE exact CVE_2010_1240
    PDF uses the Adobe Reader/Acrobat Launch action pattern associated with CVE-2010-1240: cmd.exe is invoked with attacker-controlled parameters, paired with an embedded/exported payload.
  • Launch action critical PDF_LAUNCH
    PDF contains a /Launch action whose target is an executable, URL, or UNC path — can start an external application
  • Embedded Windows executable payload in PDF stream critical PDF_EMBEDDED_PE_PAYLOAD
    PDF stream bytes contain an embedded Windows executable with a verified PE header. Exploit chains often hide droppers inside ordinary streams rather than standard /EmbeddedFile attachments.
  • /Launch action target: cmd.exe critical PDF_LAUNCH_COMMAND
    PDF /Launch action specifies an executable target with parameters '/Q /C %HOMEDRIVE%&cd %HOMEPATH%&(if exist "Desktop\\hello.pdf" (cd "Desktop"' — references a known-dangerous executable (cmd, PowerShell, etc.).
  • ClamAV: Pdf.Tool.Agent-1388586 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Tool.Agent-1388586
  • 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.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser exited 1. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0022_000.js
9fa449ae07b35544186247aadfc797edb30acb5bd6d2424c3114dc06ec5e528d		 pdf-javascript-stream PDF /JS object 22 at offset 0xEDB3 54 bytes
stream_004_off000040d1.bin
d6f50e045f7b7d0f878db71718af69a008b86e16ec334b3a04d7f3fd64f02d48		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x40D1 73802 bytes
font_00_sfnt_off000007a6.bin
a841b062cd8a39530939b08fc4b912e9e1da4c7a33a5c91c395ebda0075bf22e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A6 414188 bytes

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