Malicious PDF — malware analysis report

Static analysis result for SHA-256 3743e59a77f955b4…

MALICIOUS

PDF

313.1 KB
MD5: 06dfbb7b137180d90bfd56372a843e0a SHA-1: f84993b2cf65858ced30af1615db21e3d3ba7f90 SHA-256: 3743e59a77f955b46d312b23b92e4e3c4f62911b51409a80506dde9ace4197f8
218 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of PDF_EVAL and PDF_UNESCAPE calls within the JavaScript stream suggests that the script is designed to be executed dynamically, likely to download and run a second-stage payload. ClamAV detection as 'Pdf.Exploit.Agent-35646' further confirms its malicious nature. The extracted JavaScript file 'stream_002_off00000329.js' is a key indicator for further analysis.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3235

Heuristics 8

  • ClamAV: Pdf.Exploit.Agent-35646 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-35646
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • 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. (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)
  • 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_002_off00000329.js
8e34797162bcda22198f4dc3bba84a6b5771d6e0ba3363e298844b02b46517ab		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x329 4574 bytes
Detection
ClamAV: Pdf.Exploit.Agent-35646
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
objstm_0024_00.bin
7e2c4568497ea4d54ec7309c479a9bb3c85e020fcf4ca1ae9a71d9b6813625c8		 pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 332 bytes

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