Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b4e6aca00683c1b…

MALICIOUS

PDF

44.9 KB Created: 2010-08-03 15:00:09 +02:00 Authoring application: Adobe LiveCycle Designer ES 8.2 (via Adobe LiveCycle Forms 8.2)
MD5: e185c97b032226f5a68be4796378d087 SHA-1: 3cf6a9db9a46513b0a42b5e896587d200883b09e SHA-256: 2b4e6aca00683c1b26462b42aaefc6976ef91be5142abbd3d506d1900c75a474
92 Risk Score

Malware Insights

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

The PDF file contains multiple embedded JavaScript streams, with one stream (stream_010_off000024e5.js) being flagged as a suspicious payload. The ML classifier also identified the PDF as malicious. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, which is a common technique for delivering malware via malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9082

Heuristics 8

  • 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.
  • 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
  • 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://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xfa/promoted-desc/
    • http://www.adobe.com/products/acrobat/readstep2.html
    • http://www.adobe.com/suppor\
    • http://www.adobe.com/support/products/

Extracted artifacts 10

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0073.bin
91804242fc1820b0901e741ccb58717c3f94737ce61fae89a1c032786ae65440		 pdf-embedded-file PDF EmbeddedFile object 73 at offset 0xAD3B 162 bytes
embedded_file_obj0074.bin
7acb096dbbc8e4614907cb8a63719f68be4ab64e4994dc644616f5a18610fb70		 pdf-embedded-file PDF EmbeddedFile object 74 at offset 0xAE2C 2228 bytes
javascript_obj0022_000.js
529357503ec67b623d2a12816cdeea62bd639f2b4ff4e568b01c96cc3f5bfc6f		 pdf-javascript-stream PDF /JS object 22 at offset 0x1BA3 1363 bytes
javascript_obj0023_001.js
e985b5df65c8c3cf732a9074b575fbc594c1c7f0bccc0994182ec7e5c0f7308a		 pdf-javascript-stream PDF /JS object 23 at offset 0x1D80 902 bytes
javascript_obj0024_002.js
0ab3d232b2f2272b7039ee3e45d0be78ade06bb45327a799559ad4a592ef5a3d		 pdf-javascript-stream PDF /JS object 24 at offset 0x1EDA 1169 bytes
stream_009_off00002200.js
114a28808be13308b9b10f86f5980f03402071757c5f8d05c8c38a47051e35e8		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2200 1432 bytes
stream_010_off000024e5.js
f6a674beb67b769fe9df38c5d082f2670357cadc647066667a11c6c61ce59de1		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x24E5 40902 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 15 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).
stream_011_off00004bb6.bin
0c6a52d09299b9d2c335c01b653af0e669a58fd4908151145588b24b16c7f964		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BB6 2915 bytes
stream_013_off00005143.bin
59014517e191bf253573fe586d17ef0d27a274e2fc3c11ad36a2d347bd0c7d52		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5143 346 bytes
stream_014_off0000525a.bin
48af322df599fd152a56a4b6fc976a61e60b7194b32d3f0517bfdff6e5d27604		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x525A 16416 bytes

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