Malicious PDF — malware analysis report

Static analysis result for SHA-256 a626409b8aa39ef7…

MALICIOUS

PDF

7.8 KB
MD5: f91da386f4bcaaf62b2a5ec2297d6722 SHA-1: 81888929ad6d8242bf38e7075a127dc815faf4f2 SHA-256: a626409b8aa39ef7c5fcd4982de648783dfdc65f769f46739a4b74de68f8bef9
88 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The JavaScript stream, specifically stream_002_off00000328.js, contains an eval() call and exhibits obfuscation, indicating a malicious intent to execute arbitrary code. This is likely used to download and execute a secondary payload. The ML classifier also strongly suggests maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9483

Heuristics 5

  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (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)
  • 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_off00000328.js
9b652d161d58fbe2738a9165e9d102f5b7785429659d888eef827e54477d8fdd		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x328 2825 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
objstm_0024_00.bin
7e859040fadfddde9950c04289c0c2658b328da60ca5b73f5a473928a9e68ab9		 pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 331 bytes

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