Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4b1a589e87dce2…

MALICIOUS

PDF

5.5 KB
MD5: a2c4ad8076f12dea4481fafd71ebdd7a SHA-1: 5ff58211cec633c04ac6c0c78a93a5fade58e2e3 SHA-256: 7b4b1a589e87dce2209332bfb83436528d5560856e1138782f315657192676e3
254 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript that is heavily obfuscated, but its structure suggests it is designed to exploit a vulnerability and download a second-stage payload. The presence of PDF_JS_EXPLOIT_CLUSTER and ML_NYX_PDF_MALICIOUS heuristics, along with ClamAV detection of 'Win.Trojan.Agent-36103' on both the main file and an extracted artifact, strongly indicates malicious intent. The JavaScript's obfuscated nature and its likely role in downloading further malware are key indicators.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 10

  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
  • ClamAV: Win.Trojan.Agent-36103 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Agent-36103
  • 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.
  • 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.
  • 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.
  • 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
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0012_000.js
784a3219af11daf98cf784bdaa900f32438c4c8b6061e0866e5c359d349d6031		 pdf-javascript-stream PDF /JS object 12 at offset 0xBFB 8389 bytes
Detection
ClamAV: Win.Trojan.Agent-36103
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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