Malicious PDF — malware analysis report

Static analysis result for SHA-256 07283c59574c527e…

MALICIOUS

PDF

93.8 KB Created: ¢m003Ùo>ÎÊQü˜°rbÁהŽ+Ç@½
MD5: b697b6ad0702be2c501d0faedf68e2c8 SHA-1: e235374b50bdbfb6c45701903fb036fd77d125d7 SHA-256: 07283c59574c527e360f04e31b3df09072b699d91a2d0bab5644a1f5bfabd500
92 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1140 Deobfuscate/Decode Files or Information

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. The ML classifier also flagged it as malicious with high confidence. The JavaScript code, specifically `eval("eval(\""+getField(\"e\").value+\"\")");`, suggests an attempt to deobfuscate and execute further malicious content, likely a second-stage payload. The presence of an embedded URL further supports this, pointing to a potential download source.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • Encrypted PDF carries /JavaScript — payload hidden from static analysis high PDF_ENCRYPTED_WITH_JS
    PDF declares /Encrypt and also references an executable trigger (/JavaScript). Document encryption hides the JavaScript body and stream contents from static scanners — combined with auto-execution indicators this is a known evasion pattern used to deliver weaponised JavaScript that the analyst cannot inspect without the decryption key.
  • 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.cadkas.com

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0026_000.js
76e21958c55cd739dc2b69ddc0b41e5d5cf8ff3ddaccfc6393f1aec9622bde05		 pdf-javascript-stream PDF /JS object 26 at offset 0x99E7 42 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
javascript_obj0032_000.js
4da4f73f6618057b400e95eb90896b30eebd559b412ef35499db75cc5f969607		 pdf-javascript-stream PDF /JS object 32 at offset 0x2038 42 bytes

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