Malicious PDF — malware analysis report

Static analysis result for SHA-256 d194a69f1820f8b6…

MALICIOUS

PDF

35.0 KB Created: 2009-08-30 00:20:17 UTC Authoring application: AdobePS5.dll Version 5.2.2 (via Mac OS X 10.5.8 Quartz PDFContext)
MD5: 36f2b90449d511af58d03da920abff4a SHA-1: fc48ed816b63bba6df81ec02363b7d3751c80dd7 SHA-256: d194a69f1820f8b668f50840adb551828dc95053b41bed86e68491e32ff03e53
384 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

This PDF document exploits CVE-2010-1240 to launch cmd.exe, which then attempts to execute a payload. The payload is an embedded PE file detected by ClamAV as Win.Trojan.ShellcodeReverseTcp-1. The PDF also contains JavaScript and an embedded file, further indicating malicious intent. The overall goal appears to be the execution of a second-stage payload via a vulnerability in the PDF reader.

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\\form.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
  • 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.
  • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0022_000.js
eff4a0943aaff2d99cb5c8666337775c91d4d5f687782df94d2c5fc77becde7f		 pdf-javascript-stream PDF /JS object 22 at offset 0x8849 53 bytes
stream_003_off00003b9e.bin
1bffce2efa04cec5aebaae33991d94458a74dca8702200824ef7dddc5be14ae5		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3B9E 37888 bytes
Detection
ClamAV: Win.Trojan.ShellcodeReverseTcp-1
Obfuscation or payload: unlikely
icc_00_off000002d6.icc
2b3aa1645779a9e634744faf9b01e9102b0c9b88fd6deced7934df86b949af7e		 pdf-icc-profile PDF ICC profile at offset 0x2D6 3144 bytes

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