Malicious PDF — malware analysis report

Static analysis result for SHA-256 da921ec30355660a…

MALICIOUS

PDF

3.4 KB Created: 2005-09-29 09:27:34 UTC Authoring application: Adobe PDF Library 8.0
MD5: dc001103befb68afad7ac1ad39e2201c SHA-1: 063ebafb396e22525ff8afbb45bf96f64e8d8373 SHA-256: da921ec30355660ad15663787734fe111a329fe331314bc42bb9b0adf62270d0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious File T1566 Phishing T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript and an embedded file, triggering heuristics for PDF_JAVASCRIPT, PDF_JS, and PDF_EMBEDDED. Crucially, it exploits CVE-2010-0188 via an XFA image, indicating a deliberate attempt to execute code upon opening. ClamAV also detected a known trojan signature (Win.Trojan.E-51) within an extracted artifact, confirming the malicious nature of the embedded content.

Heuristics 7

  • Adobe Reader LibTIFF XFA image exploit — CVE-2010-0188 critical CVE likely CVE_2010_0188
    PDF contains XFA image data with an inline crafted TIFF payload and shellcode/delivery markers. This is the data-bound variant of the CVE-2010-0188 Adobe Reader LibTIFF/XFA exploit shape.
  • 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.
  • 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
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0004.bin
0e631c2c43d87b6095677b0b22e19ffe2757dd998103ac010c7ab565a905d69f		 pdf-embedded-file PDF EmbeddedFile object 4 at offset 0x1C6 35879 bytes
Detection
ClamAV: Win.Trojan.E-51
Obfuscation or payload: unlikely

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