Malicious PDF — malware analysis report

Static analysis result for SHA-256 a355fce1426e7783…

MALICIOUS

PDF

3.4 KB Created: 2005-09-29 09:27:34 UTC Authoring application: Adobe PDF Library 8.0
MD5: 07e48e0152b0ed7af0df7e296a0d17e2 SHA-1: d5ceb1a40b8d75fe91f6faf59979635f67af447d SHA-256: a355fce1426e7783706f5db994d88dc8ebccb5e44c92a392cb9efec48e4dfbc6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious File T1059.001 PowerShell

The sample is a PDF document that contains embedded JavaScript and an embedded file. A critical heuristic firing indicates the exploitation of CVE-2010-0188 via an XFA image payload, which is a known vulnerability in Adobe Reader. The embedded file was detected by ClamAV as Win.Trojan.E-51, suggesting it is a malicious payload. The JavaScript actions and embedded file point towards a delivery mechanism for a Trojan.

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
a7e27bb1b875256a27797d057ec4d523178fec45f43f4536d0e25c123dbf4502		 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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