Malicious PDF — malware analysis report

Static analysis result for SHA-256 0128546f5b931635…

MALICIOUS

PDF

11.9 KB Created: 2011-02-13 18:13:38 Authoring application: mus sal
MD5: 0d197ba3b9ea09076ac05b4c6c06ef79 SHA-1: 84ae7c08bdfd8672c54521261ac12fdf216fa214 SHA-256: 0128546f5b931635212e8d9ebda4e9fd846e19603009e84d7427c31a9a1e6b6a
270 Risk Score

Malware Insights

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

The PDF utilizes XFA forms with embedded JavaScript, triggering a heap-spray exploit. This exploit is designed to download and execute a secondary payload, as indicated by the 'PDF_XFA_HEAP_SPRAY' and 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristics. The ClamAV detection 'Pdf.Dropper.Agent-7221948-0' further confirms its malicious nature as a dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 9

  • XFA form contains risky executable script high CVE related PDF_XFA_SCRIPT
    PDF embeds an XFA form whose script block contains exploit, submission/launch, or shell-execution primitives. Ordinary LiveCycle print/update scripts are left as generic XFA/JS signals unless stronger behavior is present.
  • XFA JavaScript heap-spray exploit code critical PDF_XFA_HEAP_SPRAY
    PDF contains XFA script content with heap-spray or shellcode-like JavaScript markers such as large encoded word sequences, util.pack, large arrays, or spray variable names. This is a weaponised Adobe Reader exploit pattern, not a normal interactive form.
  • ClamAV: Pdf.Dropper.Agent-7221948-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7221948-0
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • 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://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/
    • http://www.xfa.org/schema/xfa-template/2.5/

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0001.bin
d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777		 pdf-embedded-file PDF EmbeddedFile object 1 at offset 0xB1C 84 bytes
embedded_file_obj0012.bin
24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0xBCE 228 bytes
embedded_file_obj0008.bin
c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xCBE 199 bytes
embedded_file_obj0016.bin
15f64f374b21194fcdb6b2878b0a1948b27d1a5f988da1b67d91f5f5dda83fbe		 pdf-embedded-file PDF EmbeddedFile object 16 at offset 0xDAF 119 bytes
embedded_file_obj0011.bin
e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0xE67 77 bytes
embedded_file_obj0004.bin
92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a		 pdf-embedded-file PDF EmbeddedFile object 4 at offset 0xF0D 56 bytes
embedded_file_obj0013.bin
11607927d7caab51c3fab85d5e4a58d28f330bf5420031381d2638673063f95f		 pdf-embedded-file PDF EmbeddedFile object 13 at offset 0x1244 11079 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).

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