Malicious PDF — malware analysis report

Static analysis result for SHA-256 732e994684df30ac…

MALICIOUS

PDF

278.5 KB Created: 2010-04-02 21:37:19 +08:00 Authoring application: WPS Office 个人版 (via PDFlib 7.0.3 (C++/Win32)) First seen: 2026-05-10
MD5: 645f9c058bac5306c5f0e0f7fd84600f SHA-1: 62b451fd0248fbb6f6d6911a94364aae9acbe2b0 SHA-256: 732e994684df30ac1e001ed31d0ef196a3126ff3ca95be74c3d291e17a650b8b
494 Risk Score

Malware Insights

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

The PDF file contains a critical PDF_LAUNCH heuristic firing, indicating a launch action that targets cmd.exe. Additionally, a PDF_LAUNCH_PLUS_DROPPER_JS heuristic indicates that a JavaScript API was used to export a data object, which is then launched. The embedded JavaScript explicitly calls `this.exportDataObject({ cName: "h1n1", nLaunch: 0 });`, and the document body suggests commands like `cmd.exe cd "Desktop" cd "My Documents" cd "Documents" start h1n1.pdf`. This indicates an attempt to execute a payload disguised as 'h1n1.pdf'. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • ClamAV: Pdf.Exploit.Agent-22424 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-22424
  • 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\\h1n1.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.
  • /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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 2 image(s), only 0 text block(s), carries a click-outward action, and is only 278 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • JavaScript action low 1 related finding 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

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
h1n1.pdf pdf-embedded-file PDF EmbeddedFile object 26 at offset 0x3CE33 66560 bytes
SHA-256: c22342c29dbecc0bb1f5e27c11b585f670fe5f264300faa0bbe1be9869724a34
Detection
ClamAV: No threats found
Obfuscation or payload: likely
actual_type=PE; declared_or_context_type=PDF; filename=h1n1.pdf; kind=pdf-embedded-file
javascript_obj0027_000.js pdf-javascript-stream PDF /JS object 27 at offset 0x45637 53 bytes
SHA-256: 6869fc83c42b686072c42080f546b2ed54ad11ba0268be9cd3d47bf85492d587
Preview script
First 1,000 lines of the extracted script
this.exportDataObject({ cName: "h1n1", nLaunch: 0 });

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