Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9186f21e5a30215…

MALICIOUS

PDF

12.4 KB Created: 2010-03-10 13:48:00 -07:00 Authoring application: Acrobat PDFMaker 9.1 for Word (via Adobe PDF Library 9.0)
MD5: 823a863db88ae8a9f7609d4c127b5692 SHA-1: f7f4aba791a0fa60c01cd3767bff25889637b830 SHA-256: f9186f21e5a30215478e8aa7c51c3f9b2fb1d1ca631e304a93656114626e443e
98 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. The presence of PDF_EVAL and PDF_UNESCAPE firings suggests the script is obfuscated and likely uses eval() and unescape() to execute malicious code. This pattern is commonly used to download and execute further stages of malware. No specific family could be identified due to the obfuscation.

Heuristics 6

  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/pdfx/1.3/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0039_001.js
f5f8dc632db65e2175ec6509d507f09e96449c138d4d9e5b4f696531d975f7e6		 pdf-javascript-stream PDF /JS object 39 at offset 0x20E6 12201 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 4 eval/decoder/string-building token(s).
objstm_0054_00.bin
ae3e17da3293644f47707bd720433402351ef93104e9326509c2b78a8e071f8a		 pdf-objstm-decoded PDF /ObjStm 54 0 obj (inflated) 276 bytes
icc_00_off00001dea.icc
653b586c4707574ffcd648ba35494daed2c76ceafcf4c07d315ed961b1dc347f		 pdf-icc-profile PDF ICC profile at offset 0x1DEA 408 bytes

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