Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1da5cedd04568a8…

MALICIOUS

PDF

114.1 KB
MD5: d4aafb659dd28bce16f8a80766aac660 SHA-1: 76b09fa897b1f1f095556092b2b831fceb716eab SHA-256: f1da5cedd04568a84a55b140ab72f38ef596666c8238c10493e14168ee21d17a
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 PDF_EVAL and a secondary embedded PDF with suspicious findings (POLYGLOT_CHILD_PDF_STATIC_TRIAGE) suggests the JavaScript is likely used to execute malicious code or download further payloads. The exact intent of the script is obscured by obfuscation, but its presence and the associated heuristics point to a malicious delivery mechanism.

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_off000181c6.pdf
a1fd528f7b9854f0227000971505d5095c541eaf2d461706f6ec5ecb1d327c69		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x181C6 18042 bytes

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