Malicious PDF / .EX — malware analysis report

Static analysis result for SHA-256 ecc1fea2b0058387…

MALICIOUS

PDF / .EX

70.1 KB
MD5: 84b6f25771a4d6980c0675818659a963 SHA-1: c3666f9b3c88389ab2d7ab24b1005ad9470d0599 SHA-256: ecc1fea2b005838731ec0126e730cba38522c8de3f67f7ae9acba7a678299323
66 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.002 Spearphishing Attachment

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_UNESCAPE heuristic suggests obfuscation techniques are in use. The embedded JavaScript stream, named 'javascript_obj0013_000.js', is likely responsible for downloading and executing a second-stage payload. The presence of an embedded URL further supports this delivery mechanism. The document body content is not indicative of a specific lure.

Heuristics 6

  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits
  • 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
  • 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.bitstream.com
    • 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_obj0013_000.js
d3846f8d521464ebdbde7fcd5c0a2e88db1a69db872fc1bd75d57ea516b071d8		 pdf-javascript-stream PDF /JS object 13 at offset 0x10531 3935 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
font_00_sfnt_off00000352.bin
a8f4d9b7d604c3c8a0bf3f9a31b9e952d467f98d118fdc784d95d689a14d8a33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x352 65932 bytes

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