Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b7ce664f73b9f3e…

MALICIOUS

PDF

8.2 KB
MD5: 44e466bdc5d45fbe05996943f27cb78a SHA-1: e532f0a81354a7951cd01dfdd28995f90e5d5274 SHA-256: 4b7ce664f73b9f3eca4707375799cf87bffa5d74925f4e7e30c0b84e73c9d432
66 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript that utilizes eval() and String.fromCharCode() for obfuscation, indicating a malicious intent to execute arbitrary code. The heuristic firings suggest that this script is designed to download and execute a second-stage payload. While the exact payload is not discernible from the static analysis, the obfuscated nature and use of JavaScript point towards a downloader or dropper functionality.

Heuristics 6

  • 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)
  • 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_003_off000004a4.js
eff328479adfae2f2ee4606c160c5d62cb5fecf53e9cbb3868bdb966350af109		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A4 2804 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
objstm_0025_00.bin
ec4000ca4289ce92eb64b68248f89387e2eb17158951a7a5275a2d2d33caee0b		 pdf-objstm-decoded PDF /ObjStm 25 0 obj (inflated) 425 bytes

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