Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1df53e93f31e447…

MALICIOUS

PDF

28.0 KB
MD5: b8600a93bf2b3dd756c57802dae0766f SHA-1: 62cfd56daf03dbba858bf55f0ff60ce1cd3f2fbd SHA-256: f1df53e93f31e44783381d7ae334dae97b5faa2258daf83b2156fe7263032e45
484 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.003 Windows Command Shell

The PDF file contains embedded JavaScript and a launch action that executes cmd.exe, indicating an attempt to exploit CVE-2010-1240. The embedded artifact 'form.pdf' is detected as a Windows executable payload by ClamAV, specifically identified as 'Win.Trojan.Rozena-131'. This suggests the PDF acts as a dropper for a secondary malicious executable.

Heuristics 11

  • 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.).
  • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
form.pdf
c05fcae549a4e30bb382063bcd2a74dda6a7c433437f6b75343be78825ff244e		 pdf-embedded-file PDF EmbeddedFile object 28 at offset 0x1FA0 37888 bytes
Detection
ClamAV: Win.Trojan.Rozena-131
Obfuscation or payload: unlikely
javascript_obj0029_000.js
eff4a0943aaff2d99cb5c8666337775c91d4d5f687782df94d2c5fc77becde7f		 pdf-javascript-stream PDF /JS object 29 at offset 0x6C08 53 bytes
icc_00_off000002b7.icc
94722fe267764797f8887379cc0d355f5118beb3d186e087bfbd9e1a3f2d3f49		 pdf-icc-profile PDF ICC profile at offset 0x2B7 1296 bytes

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