Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a9ad7d7624ac141…

MALICIOUS

PDF

57.2 KB Created: 2013-05-09 15:13:30 +02:00 Authoring application: Adobe LiveCycle Designer ES 9.0 (via Adobe LiveCycle Forms 9.0)
MD5: 2986989c7d3b7bafc01856b087a6f7d6 SHA-1: 7810755aa40e2c77ae8cc86632dc189cfec3fe72 SHA-256: 4a9ad7d7624ac141d609b12d5403005f52cbe1fac8b1dea6b368c3c306f661b2
80 Risk Score

Malware Insights

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

The PDF contains multiple embedded JavaScript streams and a decompressed script payload, strongly indicating malicious intent. The ML classifier also flagged this PDF with high confidence. The embedded scripts are likely responsible for downloading and executing a second-stage payload, as suggested by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristic. The presence of XFA forms and JavaScript actions points towards exploitation of PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9823

Heuristics 7

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/

Extracted artifacts 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0023_000.js
529357503ec67b623d2a12816cdeea62bd639f2b4ff4e568b01c96cc3f5bfc6f		 pdf-javascript-stream PDF /JS object 23 at offset 0x2D8A 1363 bytes
javascript_obj0024_001.js
e985b5df65c8c3cf732a9074b575fbc594c1c7f0bccc0994182ec7e5c0f7308a		 pdf-javascript-stream PDF /JS object 24 at offset 0x2F66 902 bytes
javascript_obj0025_002.js
0ab3d232b2f2272b7039ee3e45d0be78ade06bb45327a799559ad4a592ef5a3d		 pdf-javascript-stream PDF /JS object 25 at offset 0x30BF 1169 bytes
stream_010_off000033e3.js
49be9ef8c0c480f7e41eddddf30b2327a798e2149a651e4790a2c5cf7be93a90		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33E3 7681 bytes
stream_011_off00003d5e.js
6605750fede30b8fb74b0779013cfeac355b956a99ff78c22ae3f9908919cd29		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3D5E 69656 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
stream_012_off000082e3.bin
b8e0ecf057b8d0fb39f019f129c1f0ea1cab104ffc9d91b3db8a1dff4f7eb471		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x82E3 4823 bytes
stream_013_off000086fc.bin
ab840580042e7bf9ac9bdc944a07d49d5c71b5071421b69b2bb793d5d8f22b63		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x86FC 164 bytes
stream_015_off00008ad4.bin
5dd17d7f279f3210bccbfd8cc1cb45e7a5b02d093cc129033253ec22eb155026		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8AD4 13286 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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