Malicious PDF — malware analysis report

Static analysis result for SHA-256 49ab795724bb9bf1…

MALICIOUS

PDF

6.2 KB
MD5: 453b7b6d1776f4798cfe6430c1b1bdde SHA-1: c8d134dd21ea60b196bd4cba2e0418b96a3444e9 SHA-256: 49ab795724bb9bf146dc067d45f77ff7344dcd67beb98f246b1f24f88e0b0cb1
106 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, PDF_UNESCAPE, and PDF_FROMCHARCODE. The embedded JavaScript stream, stream_002_off00000324.js, is likely responsible for executing malicious code. The obfuscation suggests an attempt to evade detection and potentially download a second-stage payload.

Heuristics 7

  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • 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. (matched inside decoded stream)
  • 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. (matched inside decoded stream)
  • 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)
  • 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.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00000324.js
0be1eb1322f12d26e50d2c8efedd5a89fcb39a5d7b03a8d20dea8926f4b29728		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x324 322 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s).
objstm_0024_00.bin
d39287b89b05ab4a7d255b751dcf91920104eeba565a6f50498ebf6e4d0a45df		 pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 331 bytes

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