Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc39ae72f449d5f3…

MALICIOUS

PDF

19.56 MB
MD5: 0902293f19286270122eacba8bf74c49 SHA-1: d9a00b804bd4611b17ebd0803c2fb8447eb67cff SHA-256: cc39ae72f449d5f329ef9be8e2f7678b51c64834d79dbacda735e932641d36cd
514 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.003 Windows Command Shell T1105 Ingress Tool Transfer T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and a launch action that targets cmd.exe, indicating an attempt to execute arbitrary commands. It also embeds a Windows executable payload disguised as a PDF file, which is detected by ClamAV as 'Win.Trojan.MSShellcode-6360728-0'. The combination of these factors strongly suggests a malicious intent to deliver and execute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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\\magna14eeagrant_ignifugos_cast.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 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
magna14eeagrant_ignifugos_cast.pdf
7764be6db80b6bcb5ffc543a7a0d655e47c340ff80b9d1da48b46ba71fde5022		 pdf-embedded-file PDF EmbeddedFile object 61 at offset 0x2234B 4194304 bytes
Detection
ClamAV: Win.Trojan.MSShellcode-6360728-0
Obfuscation or payload: unlikely
javascript_obj0062_000.js
ff5bd1e4f12cd78335ddb92ca4c16f15a4b8b66f9207ccaa48443237ccb753a5		 pdf-javascript-stream PDF /JS object 62 at offset 0x138F214 79 bytes
stream_012_off0001bfe6.bin
b85b78fa73fcf4a35bd30ba5e7b6a4bd25201235a52e36bffbec7421e1fa25aa		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1BFE6 35252 bytes
icc_00_off00014851.icc
2b3aa1645779a9e634744faf9b01e9102b0c9b88fd6deced7934df86b949af7e		 pdf-icc-profile PDF ICC profile at offset 0x14851 3144 bytes
font_00_sfnt_off00017fb0.bin
f0041a1a7509cd1f200b32258a987e4966829ce420822be3f07d25a4e16c446f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17FB0 6780 bytes
font_01_sfnt_off000195b4.bin
968045a3078f11e14bdff5dbe4fcd14b7846a610f6b3fdfca69961973d4a2d26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x195B4 16728 bytes
font_03_sfnt_off000214bc.bin
810bf0c85ecf7fc41c784217bc696e4cf795893624b91529a06b316011dca482		 pdf-font-stream PDF embedded font (sfnt) at offset 0x214BC 2572 bytes

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