Malicious PDF — malware analysis report

Static analysis result for SHA-256 390cbc13f4e28270…

MALICIOUS

PDF

174.0 KB Created: 2009-06-23 15:36:37 +08:00
MD5: 525016fcb25763b046b2ba70e404d4bc SHA-1: 9e5ff74d4a6f023176d517e26dd5d0f90ae717d1 SHA-256: 390cbc13f4e28270c70a6b93652a8c11fa0a67471102af3d9312dc51780a37b2
74 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF contains an embedded JavaScript stream which is heavily obfuscated. Heuristics indicate the presence of eval() and String.fromCharCode calls, typical of JavaScript used to download and execute further malicious content. The embedded JavaScript stream is the primary indicator of malicious activity, suggesting a downloader or dropper functionality.

Heuristics 7

  • 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)
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload (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_004_off00000674.js
9f863e4c538c25d2923eeaea7969b2f86922a9a4bdc9033c243d8ce75fb49f5a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x674 3572 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
objstm_0026_00.bin
baff9946df1e799d07a756f256be83cffd595ab3192509f9b890eba794a603bb		 pdf-objstm-decoded PDF /ObjStm 26 0 obj (inflated) 306 bytes

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