Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d7a9d6dd660353d…

MALICIOUS

PDF

43.2 KB Created: 2006-10-03 13:54:05 -05:00 Authoring application: OmniForm Premium (via APJavaScript 2.2.1 Windows SPDF_1112 Oct 3 2005)
MD5: 640e4d28fe287f1ce7d3d7ce60aa9fd7 SHA-1: 5bddf1573f3ec7c3cd41e7263f7fbb02676e2fec SHA-256: 8d7a9d6dd660353db9388523977f6dbeeb231312deb76600a166f7b582cd9301
142 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, identifying it as Pdf.Dropper.Agent-7281281-0. The presence of embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_EMBEDDED_SCRIPT_PAYLOAD, strongly suggests that the document is designed to execute malicious code. The embedded script likely serves as a dropper for a secondary payload, although the exact nature of the payload cannot be determined from the available evidence. No benign URLs were found, and the document body was heavily obfuscated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Dropper.Agent-7281281-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7281281-0
  • Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • 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.
  • 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
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/iX/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/pdfx/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000a314.js
d1dfd457a2fdd3cec4091f689f39b85b35666aa5599ef3a8d5f9a80d1e2ce105		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA314 1042 bytes
font_00_type1_off0000a7c2.bin
c6bf78478c9c4dd5b3b86554d34c78f847f70af4118f9ff083c1fccf0e8e932b		 pdf-font-stream PDF embedded font (type1) at offset 0xA7C2 97 bytes
font_01_type1_off0000aa51.bin
b749644b3e758e7335900ab2e7499eaa64b3a946849f1f8a0948287bdd96763d		 pdf-font-stream PDF embedded font (type1) at offset 0xAA51 144 bytes

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