Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5cbb6fdd82c8e9…

MALICIOUS

PDF

191.7 KB
MD5: fdf709e52faa79ae70decb8ab27b4740 SHA-1: 3ea046b502cd48274fc23893caa7b8f49aaab9b1 SHA-256: de5cbb6fdd82c8e976ebbdbb235c1385c19f943055b8e20b29be5f646c828d58
166 Risk Score

Malware Insights

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

The PDF file contains multiple embedded JavaScript streams, with high-confidence heuristics indicating the use of eval() and unescape() for obfuscation. A specific heuristic also flags a U3D/3D content vulnerability in Adobe Reader (CVE-family). This suggests the document is designed to exploit this vulnerability to execute the embedded JavaScript, which likely downloads and executes a second-stage payload. No specific malware family could be identified.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4662

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. (matched inside decoded stream)
  • 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. (matched inside decoded stream)
  • 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://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
stream_002_off000006cf.js
c3e4117607b5015bbb83ef3a5da0b91ac091a6999b4ed58723839b3b2b088c69		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x6CF 42907 bytes
stream_015_off0000eca0.js
4c34d4a561ecc70741d35e2e91574317fd425d8c27f743ec5842b540ec70dade		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xECA0 31437 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 6 eval/decoder/string-building token(s).
stream_016_off00010326.js
e654b9d0d6fc41ff4c6ae23f1442dc3e4ac2d2677f6ea056c75946808e53631b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10326 26303 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 6 eval/decoder/string-building token(s).
stream_021_off0001b32b.js
1fdd15bdb4e589ce766e586420df9b913c93a4b63404c62c958ebba7c7061232		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1B32B 7232 bytes
stream_022_off0001bb80.js
2db9eaea4e504c5dd9c2fa7756ab305da1c46c71b117ce7c5234af6b4aafadc2		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1BB80 4752 bytes
objstm_0038_00.bin
6d750bd8dbfdd8314fabb1fdda5a861768afa2bcbffa6a961793c268ab8f4559		 pdf-objstm-decoded PDF /ObjStm 38 0 obj (inflated) 15544 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 4 long base64-like blob(s).
objstm_0043_00.bin
1ac302825121ab6a7633a5a4808c1a6b2cf9c67bc734d020af45610343de2e56		 pdf-objstm-decoded PDF /ObjStm 43 0 obj (inflated) 4846 bytes
u3d_00_off00012157.bin
ca4bde2f487fee5e16be9f0b3782129d7f12b7f6a0dd6f83d3e61ac8918a2754		 pdf-3d-stream PDF U3D 3D stream at offset 0x12157 82144 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.