Malicious PDF — malware analysis report

Static analysis result for SHA-256 3867a7c55aff9bb8…

MALICIOUS

PDF

54.2 KB Created: 2005-06-25 19:49:50 -04:00
MD5: 655b95757a6508c0004c57ec0fd54ab3 SHA-1: 44097a5d8c6c26ae67fded735d84d6381304acfc SHA-256: 3867a7c55aff9bb8060531ad3a00afad189ec6295282ee02eef68c4ca97e152a
494 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.001 User Execution: Malicious Link

This PDF file contains a critical heuristic firing for PDF_LAUNCH_COMMAND, indicating it attempts to execute cmd.exe with specific parameters. It also contains a critical PDF_EMBEDDED_PE_PAYLOAD, revealing an embedded Windows executable. The PDF_LAUNCH_PLUS_DROPPER_JS heuristic further suggests that a JavaScript API is used to drop this attachment. The embedded file is named 'blank.pdf' but is detected as a Windows executable. The external URI http://blankpdf.com/ is also present, likely related to the payload delivery or command and control.

Heuristics 15

  • 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\\blank.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
  • /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.
  • SubmitForm action medium PDF_SUBMITFORM
    PDF has a /SubmitForm action — form data can be silently posted to an attacker-controlled URL
  • 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
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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://blankpdf.com/
    • http://blankpdf.com/submit.php

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
blank.pdf
85bef7670fb1819bc25cb3ec1e07697a674c8f9b9985bd9bcdfda637ffbebef7		 pdf-embedded-file PDF EmbeddedFile object 37 at offset 0x2197 170808 bytes
javascript_obj0038_000.js
04ad71b0e65251d0c95ec2b499505ab40dc3fd832eac9ff1ab5c5b34b56498f2		 pdf-javascript-stream PDF /JS object 38 at offset 0xD462 54 bytes

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