Malicious PDF — malware analysis report

Static analysis result for SHA-256 809d3775622809d2…

MALICIOUS

PDF

153.4 KB Created: 2007-06-10 22:35:39 +03:00 Authoring application: Writer (via OpenOffice.org 2.2)
MD5: 62d80c67e1dfa3a9b693005939c643ff SHA-1: 3081d507ff8aaa19c0d3f4247dce96436b66f402 SHA-256: 809d3775622809d20de7a929465c5cba3100d5a34fee39042a029980d40ffa85
526 Risk Score

Malware Insights

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

This PDF file contains a critical PDF_LAUNCH heuristic firing, indicating it attempts to execute a command-line payload. The embedded JavaScript and the PDF_LAUNCH_PLUS_DROPPER_JS rule confirm that the PDF is designed to drop and execute an embedded PE payload, identified as Win.Downloader.24568-1 by ClamAV. The embedded executable is disguised as 'PI2.3.2.pdf' but is detected as a downloader. The URL http://posionivy-rat.com/ is likely the source for the second-stage payload.

Heuristics 14

  • 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\\PI2.3.2.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.
  • Clickable PDF combines external action with parser-evasion structure high PDF_ACTION_PARSER_EVASION
    PDF has an external clickable URI together with object graph or xref structures that make parsers disagree, such as divergent duplicate objects, parser divergence, or xref offset mismatch. That combination is stronger than a plain link: the document is both an outward-action carrier and a parser-confusion/evasion sample.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://posionivy-rat.com/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
PI2.3.2.pdf
8bc45c5475dbe3f61a63e7fddc2353042caaa495d18a57e548d8b66876267fa8		 pdf-embedded-file PDF EmbeddedFile object 54 at offset 0x24D7B 9216 bytes
Detection
ClamAV: Win.Downloader.24568-1
Obfuscation or payload: unlikely
javascript_obj0055_000.js
d776a2226fa2c0d60dcf160bc14892eb04a1a49534948b13bf6b2f27e4764efd		 pdf-javascript-stream PDF /JS object 55 at offset 0x261CF 56 bytes
stream_013_off0001833e.bin
8ab00ffa8b605f52a8291a520eecb5bdf98609b8aaa70a7f70526841f27f8b0d		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1833E 47264 bytes
font_00_sfnt_off0001f61e.bin
cd5b8b6106eda36d6d94e4c16a3c601d8c21b7fe401e5adb39a547e3d7eeedf8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F61E 32184 bytes

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