Malicious PDF — malware analysis report

Static analysis result for SHA-256 604d76f0882aab78…

MALICIOUS

PDF

5.08 MB Created: 2007-10-18 11:37:17 +02:00 Authoring application: QuarkXPress: pictwpstops filter 1.0 (via Acrobat Distiller 7.0.5 for Macintosh)
MD5: 738b43f635112f46e4addadf0a272f7b SHA-1: 870a1146efcca5d4b2665cc10291b5f5f2d843c4 SHA-256: 604d76f0882aab78f6ddaa4db1b14e5049b382a25eb20e7c7fe5344ebde41001
458 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file contains JavaScript that utilizes the `exportDataObject` function, which is known to be used for launching embedded executables. This is further supported by critical heuristics indicating a launch action targeting `cmd.exe` and an embedded file masquerading as a PDF but detected as a Windows executable. The embedded JavaScript is designed to export an object named 'manualeagadslvoip-1', likely initiating the execution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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
  • /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\\manualeagadslvoip-1.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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://alicegate
    • http://192.168.1.1
    • http://www.zeustech.net/
    • http://]hostname[:port]/path
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/iX/1.0/
    • 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/xap/1.0/sType/ResourceRef#
    • http://ns.adobe.com/tiff/1.0/
    • http://ns.adobe.com/exif/1.0/
    • http://ns.adobe.com/photoshop/1.0/
    • http://ns.adobe.com/xap/1.0/g/img/
    • http://www.apache.org/

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
manualeagadslvoip-1.pdf
1013c84c602b4e1676139003d1d51b161d951da0fb7d0da84fc304554f5fa439
pdf-embedded-file PDF EmbeddedFile object 502 at offset 0x508D14 73802 bytes
Detection
ClamAV: Win.Exploit.Countdown-1
Obfuscation or payload: unlikely
javascript_obj0503_000.js
5986111e7e8735c1e1cf4f54c4db9c056e8b74bbe0f8fabba9553610cdb57384
pdf-javascript-stream PDF /JS object 503 at offset 0x5139C7 68 bytes
font_00_cff_off003da0b3.bin
a0e659417feaa6450ab20fed6c5e4d904d3801877145150769b0111201feffd2
pdf-font-stream PDF embedded font (cff) at offset 0x3DA0B3 4175 bytes
font_01_cff_off003dafa7.bin
ea2d84f9a8342c14ac6524175e704393717a4353662b3228fb1ed347d79a986d
pdf-font-stream PDF embedded font (cff) at offset 0x3DAFA7 322 bytes
font_02_sfnt_off003db20a.bin
f4bbf4dad170ba62bb21676a5ec7776dbbbfcbdd6d988fbddd58a7541e442dbe
pdf-font-stream PDF embedded font (sfnt) at offset 0x3DB20A 34860 bytes
font_03_sfnt_off003dfa88.bin
14bd344fe095674b24d6892757861a0de43599f1c41fb28dbe01f995060c27c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x3DFA88 37196 bytes
font_04_sfnt_off003e495c.bin
511f882bcff6b3abed4bba680cf2cba2c44ea1cad62c213e6767f778f8331a2a
pdf-font-stream PDF embedded font (sfnt) at offset 0x3E495C 93432 bytes