Malicious PDF / .SV — malware analysis report

Static analysis result for SHA-256 5d06a31ff10550de…

MALICIOUS

PDF / .SV

90.9 KB Created: mPF 013׌OЇv—ö¯¨œ/uÒ,€Kà
MD5: 17f31a78fed410d644992f17af16351c SHA-1: 67dcde5fac54a37ffabccef89ddfe7f9e86b256d SHA-256: 5d06a31ff10550de47ba04aee7d8dd70fcbce627949ab5a42587a699a9e86d55
92 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by an ML classifier and contains embedded JavaScript, which is used to obfuscate and hide its true payload. The JavaScript action and embedded JS stream indicate an attempt to execute code, likely to download further malicious content from the URL http://www.cadkas.com. The PDF is also encrypted using JavaScript, further obscuring its contents from static analysis.

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 0x99C3 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
7f13760feb01564b86f2c3838599aa2c37d677be563ce2ce871d12e66b84c815		 pdf-javascript-stream PDF /JS object 32 at offset 0x1FFC 42 bytes

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