Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcefdf128e1ce299…

MALICIOUS

PDF

453.2 KB Created: 2007-12-06 19:43:29 -07:00 Authoring application: PDF Publishing (version 56) (via 5.7.4.4965 Release)
MD5: efc4f653267c7534ad284e2a882e0e31 SHA-1: 4341f78a4c7e6322db4cab386fd78e767a041a13 SHA-256: dcefdf128e1ce299443db59e567f5190c55e497da8b3a43b8f7659984f01a099
166 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, indicated by multiple PDF_JAVASCRIPT and PDF_JS heuristics. The script utilizes eval() and unescape() functions, suggesting obfuscation and dynamic code execution. A high-confidence heuristic also flags U3D/3D content related to Adobe Reader 3D parser CVE-family vulnerabilities. The embedded scripts are likely responsible for exploiting this vulnerability to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4577

Heuristics 9

  • U3D/3D content in PDF — Adobe Reader 3D parser CVE-family indicator high CVE related PDF_U3D_CVE_RELATED
    PDF contains U3D (Universal 3D) or 3D annotation content — CVE-2011-2462 and CVE-2009-3953 are critical vulnerabilities in Adobe Reader's U3D processing that allow arbitrary code execution. U3D content in PDFs is extremely rare in normal documents.
  • 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)
  • 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.
  • String.fromCharCode low PDF_FROMCHARCODE
    String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
  • 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://crl.adobe.com/prodSvce.crl0
    • https://www.adobe.com/misc/pki/prod_svce_cps.htm\
    • http://crl.adobe.com/cds.crl0���~�|�z0x1
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/g/img/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#
    • http://ns.adobe.com/xap/1.0/t/pg/
    • http://ns.adobe.com/xap/1.0/sType/Dimensions#
    • http://ns.adobe.com/xap/1.0/g/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0015_000.js
c3e4117607b5015bbb83ef3a5da0b91ac091a6999b4ed58723839b3b2b088c69		 pdf-javascript-stream PDF /JS object 15 at offset 0xD67 42907 bytes
javascript_obj0064_001.js
d57f0e0c64aef2f07bac15c4031800a13ef363a09c6b65a7379e80135cbdb3d2		 pdf-javascript-stream PDF /JS object 64 at offset 0x34856 4752 bytes
stream_014_off0000919f.js
4c34d4a561ecc70741d35e2e91574317fd425d8c27f743ec5842b540ec70dade		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x919F 31437 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 6 eval/decoder/string-building token(s).
stream_015_off0000a824.js
33865621297d6832164c2e79ccbb11b1a167152e0693cd87921a6c8c0fe72614		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA824 26303 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 6 eval/decoder/string-building token(s).
stream_018_off00033fd6.js
36b5b2d1dea818eb38701e750e5e7d3a46a1667f824a1e855bc43cf9845bfe61		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33FD6 8175 bytes
objstm_2036_00.bin
ade78fb695c3206d535376290952f760e4bbe611c5245d0a0a0e1acc1d8c8dd1		 pdf-objstm-decoded PDF /ObjStm 2036 0 obj (inflated) 457 bytes
objstm_2037_00.bin
74e2349fd8b0aae8f90d04ee957f0f0624d5febce21a54727b2e9e50f40850aa		 pdf-objstm-decoded PDF /ObjStm 2037 0 obj (inflated) 7579 bytes
u3d_00_off0000bd01.bin
5c092d42d658d10cc32b05b688a9a96e0a83f79f398caac112fc6b7870b23731		 pdf-3d-stream PDF U3D 3D stream at offset 0xBD01 364200 bytes

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