Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f671294d37944ac…

MALICIOUS

PDF

14.9 KB
MD5: a3448c95ac9f6aebdf34d014ef4975ea SHA-1: 5b917ddb493fbfa4c6ffd4904cdbab9650a8ac70 SHA-256: 5f671294d37944ac5253df826c0cfcf3c3855703a16220656ecf3347a9c9ef53
150 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF file that utilizes XFA forms and contains a heap spray exploit. This exploit likely executes embedded JavaScript, which in turn attempts to download and execute a second-stage payload from the reconstructed URL: http://116.116.111.108.115.117.102.103.119.114.101.118.103.116.121.110.46.100.121.110.100.110.115.45.114.101.109.111.116.101.46.99.111.109.58.56.48.47.115.117.98.115.46.112.104.112.63.115.112.97.109.110.97.118.61.49.50.38.100.106.97.110.103.111.61.49.50.53.53.49.38.97.112.112.108.121.61.54.49.51.38.102.114.101.101.61.53.49.56. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 6

  • 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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • Embedded script payload in PDF stream low 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.
  • 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/2.4/
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://ns.adobe.com/xtd/
    • http://www.xfa.org/schema/xfa-form/2.8/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_000_off00002585.js
a00dac1d4d348c247a8fa2034a9ecc53242cb7001e8cb18e906308c5652200f2		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2585 23696 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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