Malicious PDF — malware analysis report

Static analysis result for SHA-256 22345971ad8d9c33…

MALICIOUS

PDF

117.8 KB Created: 2010-09-07 21:13:03 +02:00 Authoring application: Writer (via OpenOffice.org 2.4)
MD5: ec3afab6d57a3f51d437598b5327b270 SHA-1: 4b4fe87dbd3705d3a4e667008eae6949e5693783 SHA-256: 22345971ad8d9c3303c532c67fd7cc6b192b2479469ddbac4a07d290be69e344
562 Risk Score

Malware Insights

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

The PDF file contains a JavaScript action that triggers a launch action, exploiting CVE-2010-1240 to execute cmd.exe. This action is designed to export an embedded file named 'cv.pdf', which is actually a Windows executable payload detected by ClamAV as Win.Trojan.Swrort-5710536-0. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 13

  • 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\\cv.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 low PDF_URI
    PDF contains an external URL action

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
cv.pdf
1b6d06bc9d23cf1549d685a80a7a82d853e13540781ca29896dacf01d5c09938		 pdf-embedded-file PDF EmbeddedFile object 49 at offset 0x12713 73802 bytes
Detection
ClamAV: Win.Trojan.Swrort-5710536-0
Obfuscation or payload: unlikely
javascript_obj0050_000.js
3f9cf2bf8148d6812b1d35f217f7dab02eb2ad981d7520208f085a44dbfd60af		 pdf-javascript-stream PDF /JS object 50 at offset 0x1D301 51 bytes
font_00_sfnt_off00003af0.bin
760e3af3475fa620766432f6f31deac92f387ee370fc150f3ca07339c26e7d14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3AF0 10004 bytes
font_01_sfnt_off0000585b.bin
e2b3fdc4af5fd1933cb5b9c5cca5a61daa79cf79f1e695c40b083dd52df19964		 pdf-font-stream PDF embedded font (sfnt) at offset 0x585B 23436 bytes
font_02_sfnt_off00008235.bin
bb9c8293750d80806c34bffd118d5179086e9f0adbfe4dd5666f6ba5712381b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8235 23060 bytes
font_03_sfnt_off0000c784.bin
648cbd449830152db5fc62f36200d753d49605b03fb0289832b8a5a82c2cbed3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC784 26916 bytes
font_04_sfnt_off0000fcae.bin
f0e48748c275b44b183e7e6cb61e9458466e7b551b6c014d49307469ca41ed22		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAE 20252 bytes

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