Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c70d8499d2fcda…

MALICIOUS

PDF

93.3 KB Created: ¢m003Ùo>ÎÊQü˜°rbÁהŽ+Ç@½
MD5: adda052ad0f4a76aaf315df0d4869ae5 SHA-1: 1b4ebf6cb057080cf17f853bbe60da7f3891b0e4 SHA-256: 11c70d8499d2fcda39a3e89bffefcefc0c809498549645e07dd408eac50383d1
152 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, which is heavily obfuscated and used to hide malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely as a dropper. The JavaScript's purpose is to deobfuscate and execute further malicious code, potentially downloading a second-stage payload from the embedded URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Dropper.Agent-7230543-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7230543-0
  • 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

Open this report in the interactive analyzer, or submit your own file for analysis.