Malicious PDF — malware analysis report

Static analysis result for SHA-256 a46759adffa1c170…

MALICIOUS

PDF

492.3 KB Created: 2007-06-05 13:48:38 UTC Authoring application: Adobe PageMaker 7.0 (via Acrobat Distiller 5.0 (Windows))
MD5: f90f41bcf73441f6e0c5cf724c06a613 SHA-1: b264618539b2ac1f3dcf19febb25c1a9a96d8dd0 SHA-256: a46759adffa1c170bd13796aaa3bfbd7715723ee87553256ca63c5fa98bf51c5
514 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and a launch action that targets cmd.exe, indicating an attempt to execute arbitrary commands. The critical heuristic 'CVE_2010_1240' confirms this exploit vector. Furthermore, an embedded Windows executable payload is disguised as a PDF file named 'manual.pdf', which is a strong indicator of a dropper or downloader functionality. The ClamAV detection on both the PDF and the extracted artifact further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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\\manual.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
  • 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://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
manual.pdf
99363f42bbff489acf72ec8f00be3af3cd61c87283106f7549b7db760a9ea16b		 pdf-embedded-file PDF EmbeddedFile object 360 at offset 0x76024 37888 bytes
Detection
ClamAV: Win.Trojan.Rozena-131
Obfuscation or payload: unlikely
javascript_obj0361_000.js
76595334d20f64533a1f0fc82533236aed103be28220cf87b9da87a3d9cbf07f		 pdf-javascript-stream PDF /JS object 361 at offset 0x7ACDE 55 bytes
font_00_cff_off0000b66d.bin
4553f308971b1e5da3e6812ec61f58d072cb886bf73ca32a5b03937284ef7c70		 pdf-font-stream PDF embedded font (cff) at offset 0xB66D 2714 bytes
font_01_cff_off0006ef4d.bin
14892ea8a2064e95e9de637bc232b014d7fdc06c3572ab2dea0af09179290287		 pdf-font-stream PDF embedded font (cff) at offset 0x6EF4D 6569 bytes
font_02_cff_off00070868.bin
12cbcb5c750d37700a1aa53863c619b58c2eaad69eb3766dc8743917d420f73e		 pdf-font-stream PDF embedded font (cff) at offset 0x70868 1850 bytes

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