PDF malware analysis — malicious · 27d738b036258c3d

MALICIOUS

PDF

47.5 KB Created: 2006-03-01 07:28:26 Authoring application: Rave (http://www.nevrona.com/rave) (via Nevrona Designs)

MD5: d27123d02a80c7a01d6594c2cc99b512 SHA-1: cef513f8e2448a9fb109bc20c1ed53f2ad8c2c5a SHA-256: 27d738b036258c3d31dbf4910e82207122de8accba71689495a4b241d9d235b7

514 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.003 Windows Command Shell T1566.002 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains embedded JavaScript and a launch action that executes cmd.exe. This action is designed to exploit CVE-2010-1240 and is paired with an embedded executable disguised as 'sample.pdf'. The embedded executable was detected by ClamAV as 'Win.Trojan.MSShellcode-7', indicating it's likely a malicious payload. The PDF's structure and embedded content strongly suggest a dropper functionality.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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\\sample.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.Dropper.Agent-7241652-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7241652-0
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://www.nevrona.com/rave\

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`sample.pdf` `2e4d3aa3d372dab49cecdb9771d63b46a16304d71145c253923c62f741967460`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0xD1E	73802 bytes
Detection ClamAV: Win.Trojan.MSShellcode-7 Obfuscation or payload: unlikely
`javascript_obj0015_000.js` `e0ab7dc0ebfad6d0bd11d9d7fd7a34e80e3977e3d114c0ca19ea3d2b663a4f24`	pdf-javascript-stream	PDF /JS object 15 at offset 0xB958	55 bytes

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