Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb449332a4171c87…

MALICIOUS

PDF

9.9 KB Authoring application: Kvkjciyoab Xzvokuanp
MD5: bbe1aedb3da25387ea1d541492aa2dc4 SHA-1: 8f346e1a8cb4bc7a6c3951f38003f115a0e57f32 SHA-256: bb449332a4171c87e583939073c3db1b1b0acbe9f2d0f95f4b73e0c67bea78b9
68 Risk Score

Malware Insights

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

The ML classifier strongly indicates maliciousness, supported by heuristics flagging an embedded script payload and an embedded file. The DOC BODY contains obfuscated JavaScript that appears to be designed to download and execute a second-stage payload from the embedded URL. The embedded URL is the primary IOC for this stage of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/1.0/
    • http://www.xfa.org/schema/xfa-template/2.5/
    • http://www2.firstav-army.25u.com/?6kgoagb=Ws7U057M2suP59zYnqtkkaqT7arXpNSSyJeXndijp5mvU9Xlqqppnpiik5eZm5qY3%2Beep12RqZPamM3ZrLO7rYzZ29exlJyghQ%3D%3D&quot
    • http://ns.adobe.com/xtd/
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://ns.adobe.com/xfdf/
    • http://www.xfa.org/schema/xfa-form/2.8/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin
4063b50d160cfb755b5eb513d7ad79fdda2c99a4ad0fab69cce77fbe4d14c0aa		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0x1B7 9049 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 long base64-like blob(s).

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