Malicious PDF — malware analysis report

Static analysis result for SHA-256 786e24895a302abb…

MALICIOUS

PDF

215.8 KB Created: 2008-12-15 10:57:01 -05:00 Authoring application: PScript5.dll Version 5.2 (via Acrobat Distiller 7.0 (Windows))
MD5: 248e102baa73d0f0a95991bb258ebc85 SHA-1: 7f073f130284206e60bb3e42214caf8055d58b29 SHA-256: 786e24895a302abb4893d341ef9e949094e8079d431b4b512b411fb57f583a02
452 Risk Score

Malware Insights

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

This PDF document contains a critical PDF_LAUNCH action that targets cmd.exe, indicating an attempt to execute arbitrary commands. The embedded PE payload, detected by ClamAV as Win.Trojan.Rozena-131, is likely the second stage of the attack. The document also exhibits characteristics of a SE_SECRET_RECOVERY_LURE, suggesting it may attempt to trick users into revealing sensitive information.

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\\app.pdf" (cd "Desktop"' — references a known-dangerous executable (cmd, PowerShell, etc.).
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • 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
  • Optional Content Group with action trigger low PDF_OPTIONAL_CONTENT
    Optional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open
  • 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.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdfx/1.3/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0476_000.js
0ba4437fba88c974765e7deca1912ed76c1039c79b0ae879db220748c19e6252		 pdf-javascript-stream PDF /JS object 476 at offset 0x3593F 52 bytes
stream_030_off00030c6c.bin
c1bb18901c8487f78f4202d2800d64a553f83f3270ebddc742b8c07004f00026		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30C6C 37888 bytes
Detection
ClamAV: Win.Trojan.Rozena-131
Obfuscation or payload: unlikely
icc_00_off0000be7d.icc
2b3aa1645779a9e634744faf9b01e9102b0c9b88fd6deced7934df86b949af7e		 pdf-icc-profile PDF ICC profile at offset 0xBE7D 3144 bytes

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