Malicious PDF — malware analysis report

Static analysis result for SHA-256 c29785bac308e73c…

MALICIOUS

PDF

71.8 KB
MD5: 686f2e8cf7bbe2dc663c1397a6ecdeec SHA-1: 024388fdebfee742da320e36d7b23285c6335dad SHA-256: c29785bac308e73c487ff8ea4825d69575ec167a07d3e6d9da7942dfce5b7a73
118 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of a PDF_EVAL heuristic firing suggests that the JavaScript code is likely obfuscated and uses eval() for execution. A critical finding of POLYGLOT_CHILD_PDF_STATIC_TRIAGE indicates a secondary embedded PDF with similar suspicious findings. The extracted JavaScript file, stream_010_off00002a3f.js, is the primary artifact for analysis. The overall behavior points to a downloader or dropper mechanism, common in initial access stages of an attack.

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.
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • 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)
  • 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://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_010_off00002a3f.js
8edab7f5d6d3bc708c0e9328083b0354959e8f9d631fb43c0c99d34c90d4eac9		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2A3F 6731 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 7 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).
objstm_0029_00.bin
dc0fc170b1d5882fa1a67739f64e17705521fdd85dd8316c748159eb3ee59b0c		 pdf-objstm-decoded PDF /ObjStm 29 0 obj (inflated) 457 bytes
objstm_0047_00.bin
fb30dcc1b952dafe4c4dfef9cc7c3163f6cc551f3579bbfec1223b6e550c625b		 pdf-objstm-decoded PDF /ObjStm 47 0 obj (inflated) 32 bytes
polyglot_child_pdf_off0000d8bb.pdf
a1fd528f7b9854f0227000971505d5095c541eaf2d461706f6ec5ecb1d327c69		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0xD8BB 18042 bytes

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