MALICIOUS
514
Risk Score
Malware Insights
MITRE ATT&CK
T1204.002 Malicious File
T1059.003 Windows Command Shell
T1105 Ingress Tool Transfer
The PDF contains a JavaScript stream and a launch action that targets cmd.exe, indicating an attempt to execute arbitrary commands. Critical heuristics confirm that this launch action is paired with an embedded Windows executable payload disguised as 'de.pdf'. This payload was detected by ClamAV as 'Win.Trojan.MSShellcode-7'. The overall attack pattern is consistent with exploiting CVE-2010-1240 to deliver a secondary payload.
Machine Learning
- Nyx PDF Classifier malicious score 0.9965
Heuristics 11
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Adobe Reader Launch action command execution critical CVE exact CVE_2010_1240PDF 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.
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Launch action critical PDF_LAUNCHPDF contains a /Launch action whose target is an executable, URL, or UNC path — can start an external application
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Embedded Windows executable payload in PDF stream critical PDF_EMBEDDED_PE_PAYLOADPDF 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.
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/Launch action target: cmd.exe critical PDF_LAUNCH_COMMANDPDF /Launch action specifies an executable target with parameters '/Q /C %HOMEDRIVE%&cd %HOMEPATH%&(if exist "Desktop\\de.pdf" (cd "Desktop"' — references a known-dangerous executable (cmd, PowerShell, etc.).
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Embedded attachment masquerades: declared document, content is windows-executable critical PDF_EMBEDDED_FILESPEC_CONTENT_MISMATCHAn /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.
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ClamAV: Pdf.Tool.Agent-1388586 critical CLAMAV_DETECTIONClamAV detected this file as malware: Pdf.Tool.Agent-1388586
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ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAVClamAV 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.
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/Launch action paired with attachment-dropping JS API high PDF_LAUNCH_PLUS_DROPPER_JSPDF 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.
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JavaScript action low PDF_JAVASCRIPTPDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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Embedded JS stream low PDF_JSPDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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Embedded file low PDF_EMBEDDEDPDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
Extracted artifacts 2
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
de.pdfbcfb3d9065a1614b7e0d14783ba6f430525b54855a9c1193a4f8cd856b85da50 |
pdf-embedded-file | PDF EmbeddedFile object 123 at offset 0x8F48CE | 73802 bytes |
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Detection
ClamAV:
Win.Trojan.MSShellcode-7
Obfuscation or payload:
unlikely
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|||
javascript_obj0124_000.js40c406674f7f8c8ee2e9bf076cafcfd7c52f7db746b168f01d47c22b90d365ac |
pdf-javascript-stream | PDF /JS object 124 at offset 0x8FF4B4 | 51 bytes |
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