Malicious PDF — malware analysis report

Static analysis result for SHA-256 225af32209508945…

MALICIOUS

PDF

604.9 KB Created: 2012-09-23 13:03:05 +03:30 Authoring application: Microsoft® Word 2010
MD5: 762327243ba02d74749617f40124f46a SHA-1: a7ce7353e0e5aa557b0cb0c13e9974aa78edc533 SHA-256: 225af32209508945e3437454037dee8742c851ef931a8096ee290e62d64f7115
464 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.003 Windows Command Shell T1105 Ingress Tool Transfer T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript and a launch action that executes cmd.exe, indicating an attempt to exploit vulnerabilities like CVE-2010-1240. The critical heuristic 'PDF_EMBEDDED_PE_PAYLOAD' confirms an embedded Windows executable disguised as 'ospf.pdf'. This executable is likely a downloader for additional malicious content, as suggested by the 'PDF_LAUNCH_PLUS_DROPPER_JS' firing.

Heuristics 11

  • 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.
  • TrueType bitmap font + active content — CVE-2023-26369 related high CVE related PDF_CVE_2023_26369_RELATED
    PDF embeds a TrueType font with bitmap tables (EBDT/sbix/CBDT) alongside exploit delivery indicators — CVE-2023-26369 exploits the sfac_GetSbitBitmap function in Adobe's libCoolType for arbitrary code execution. This CVE was actively exploited in the wild, but this rule does not validate the malformed EBLC/EBDT primitive.
  • 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\\ospf.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.
  • 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

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ospf.pdf
66caaf3c84570ad8c5aec99ca67415f3beefb55112576c4bb85cd1c5e2b047e2		 pdf-embedded-file PDF EmbeddedFile object 747 at offset 0x8C195 73802 bytes
javascript_obj0748_000.js
30f1b7dd468118f68a4367c7763c4abe9a3933a87a34ea0437a0f44f2714e187		 pdf-javascript-stream PDF /JS object 748 at offset 0x96DE4 53 bytes
stream_037_off0004a74e.bin
c90d679ed73073bbe7b65bc67767b4f0c23a5f2572bf7f03e238b02c1eae61e4		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A74E 196056 bytes
stream_041_off000625ad.bin
b05003aee1c1471bc7466b0956938b87c4e00ed7bfa4acb95bf794f487fe8ad3		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x625AD 38352 bytes
stream_046_off00087526.bin
680951d3820e0a586c750a42fae21b5f27054d877ac013ae206abd12954a0023		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x87526 8240 bytes

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