Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dee214b85b5097d…

MALICIOUS

PDF

105.6 KB Created: 2009-03-27 09:36:58 Authoring application: FreePDF XP 1.5 - http://shbox.de (via GPL Ghostscript 8.15)
MD5: 3c25b1390f9926ec9e925d09d215438a SHA-1: 9f933ee822867e8b756f1eded65c4b20ad7afd63 SHA-256: 6dee214b85b5097d2dfc192dfd13a863e1be6aa512f04c14a2c6cdaee8a20a9c
516 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript that triggers a launch action, executing cmd.exe with parameters to run an embedded executable file named '10.pdf'. This executable is detected by ClamAV as Win.Trojan.MSShellcode-6360730-0, indicating it's a malicious payload. The embedded executable is disguised as a PDF, further suggesting a malicious intent to trick the user or security software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 12

  • 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\\10.pdf" (cd "Desktop"' — references a known-dangerous executable (cmd, PowerShell, etc.).
  • Embedded attachment masquerades: declared document, content is windows-executable critical PDF_EMBEDDED_FILESPEC_CONTENT_MISMATCH
    An /EmbeddedFile attachment's declared filename extension or /Subtype MIME type contradicts the magic bytes of its decompressed content. The attachment is declared as a benign document or image but the bytes are an executable or executable-bearing archive. This is a deliberate deception used to hide droppers in PDF attachments and is a generic indicator of embed-and-drop weaponisation, independent of any specific CVE.
  • 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.
  • /Launch action paired with attachment-dropping JS API high PDF_LAUNCH_PLUS_DROPPER_JS
    PDF combines a /Launch action with a JavaScript API call that writes or opens an attached/external resource — the canonical shape of the CVE-2010-1240 /Launch + exportDataObject family. Benign PDFs do not pair these surfaces; the combination indicates a drop-and-execute chain regardless of the specific JS API knobs or /Launch target.
  • 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
  • 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://shbox.de
    • http://www.stat.gov.pl/broker/access/index.jspa

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
10.pdf
a3aba7fe9d1dd22b055c02af9f37769410f6dcd93899c004ddba3635bc8471f9		 pdf-embedded-file PDF EmbeddedFile object 56 at offset 0xEF7F 92419 bytes
Detection
ClamAV: Win.Trojan.MSShellcode-6360730-0
Obfuscation or payload: unlikely
javascript_obj0057_000.js
6f232074cc0007fca311878e8d7ff276174e247565513fbe4b5a1fac2df05518		 pdf-javascript-stream PDF /JS object 57 at offset 0x1A266 51 bytes
font_00_cff_off0000a196.bin
6a5919fecc3ae0cb778ac0f04e81fe5678aa503110dd3d0b73bcd406069eb527		 pdf-font-stream PDF embedded font (cff) at offset 0xA196 262 bytes
font_01_sfnt_off0000a2eb.bin
ccd5668ff75d3b96c620184db44e2d9837aefbc54c5b766779cf48977e5c28a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2EB 5280 bytes
font_02_cff_off0000ad51.bin
f8965c8c2ce942244eaaedf23a2acbaebd9d08d149ac2cef9bd429a6d16f39d3		 pdf-font-stream PDF embedded font (cff) at offset 0xAD51 3906 bytes
font_03_cff_off0000bb28.bin
5198a58b3738571d601881dd40a63d075a2cd1380c2cb7dcdf8961dddf623454		 pdf-font-stream PDF embedded font (cff) at offset 0xBB28 8217 bytes

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