Malicious PDF — malware analysis report

Static analysis result for SHA-256 1df2cdbb2a099ae5…

MALICIOUS

PDF

16.9 KB Created: 2008-11-11 18:43:15 +01:00 Authoring application: Acrobat Editor 8.0 (via Adobe Acrobat 8.1.0)
MD5: 4f7f63c99bd9ddc439d9b2b6e6ee9ea8 SHA-1: 7c832c067f39a4af30948618cb7c7340d85de2f4 SHA-256: 1df2cdbb2a099ae56163b8a23286c722e2dce5ea667077cdc5a98141aa8dfa77
98 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF document contains embedded JavaScript, which is obfuscated and utilizes eval() and unescape() functions. This script is likely designed to download and execute a second-stage payload. The high heuristic scores for PDF_EVAL and PDF_UNESCAPE indicate a strong attempt to hide malicious code execution. No specific malware family could be identified.

Heuristics 6

  • 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.
  • 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.
  • 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
javascript_obj0025_000.js
be4aa50cbd241740c393f55fdd2bdc8a61666e122e989a9ec82dc98c4212b4e2		 pdf-javascript-stream PDF /JS object 25 at offset 0x5FE 44 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
legacy_pdfkit_stage_000.js
7a61b8045eef8660fcf9fdb991c88bdc240149a28db0dd32f572fd26414f9f64		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0x7B8 568 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s).

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