Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d16bca14715f6e8…

MALICIOUS

PDF

118.8 KB Created: 2009-07-23 08:47:32 UTC Authoring application: Acrobat Web Capture 6.0
MD5: 0833e9c48c90e2aee7e1343cffeb1418 SHA-1: 1e46d1443e6f4a262b5436092e285fa47d0f90f7 SHA-256: 7d16bca14715f6e82a31de3434159d3a6a3b83b4485ac1ed6674b38afb3c0087
112 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, identified by the 'PDF_JAVASCRIPT' and 'PDF_JS' heuristics. The ML classifier also flagged this PDF as malicious with high confidence. The embedded JavaScript appears to be obfuscated but is designed to execute a second-stage payload, as indicated by the string concatenation and the use of 'unescape'. The presence of an embedded PDF artifact further suggests a multi-stage attack. The primary attack pattern is likely spearphishing attachment, leading to the execution of malicious JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE
    A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
  • 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.
  • 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/iX/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0036_000.js
241720d05eb9f1399739386460cd49222f3f00f2fb3c825f619c05307ac296bd		 pdf-javascript-stream PDF /JS object 36 at offset 0x2A35 1803 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
polyglot_child_pdf_off0001abe8.pdf
3d39e6230ca4ef29355964dd9cedafe554e0e406e9665a0525bf95626c359dbb		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x1ABE8 12104 bytes

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