Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fc03e31223c2e7f…

MALICIOUS

PDF

43.1 KB
MD5: 528c8bb0b8b984d535a9741d69ac8db8 SHA-1: aa7509cfc90cb58f77e5dd16a19d4d1411fc3dd5 SHA-256: 1fc03e31223c2e7fb1e08c29339ee783bffb4c8eadc220b0a52fb4f715a86f8c
72 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command and Shell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and EXTRACTED_FILE_STATIC_TRIAGE. The JavaScript stream, named 'javascript_obj0012_000.js', is obfuscated and uses String.fromCharCode, suggesting it is designed to download and execute a second-stage payload. The presence of ASCIIHexDecode filter with exploit indicators further supports a malicious intent.

Heuristics 7

  • ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX
    Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
  • Suspicious extracted artifact medium 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.
  • 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
  • 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)
  • 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://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/2.6/
    • http://www.xfa.org/schema/xfa-template/2.6/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0012_000.js
83b02f0df35e3b7ecd5b522d23f177cd249822f9ca6734c644620c92c83c17a0		 pdf-javascript-stream PDF /JS object 12 at offset 0xA0B2 3885 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s). Carved artifact contains 4 long hex-escaped blob(s).
font_00_sfnt_off0000033c.bin
26f3e7c91c76e658576c1bbb605ddb8e33e657870ea2f8ad3b8fe8f80b303358		 pdf-font-stream PDF embedded font (sfnt) at offset 0x33C 65932 bytes

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