Malicious PDF — malware analysis report

Static analysis result for SHA-256 a290492fa70dee6c…

MALICIOUS

PDF

12.8 KB
MD5: 0398e68507882a38a26a341058c94653 SHA-1: 474cf887f3a32d6c49753fda280a09cb2bf36334 SHA-256: a290492fa70dee6ccce765ce90ce8ae7abd925a0d43014dd2f1c2458391aadf9
208 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The ML classifier and ClamAV detection strongly suggest malicious content, specifically identifying it as Win.Exploit.CVE_2010_4091-1. The unescape() function call within the JavaScript stream points to obfuscation techniques commonly used to hide malicious code. The primary attack vector appears to be the exploitation of CVE-2010-4091 via the embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 7

  • ClamAV: Win.Exploit.CVE_2010_4091-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Exploit.CVE_2010_4091-1
  • 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.
  • 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.
  • 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.
  • 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://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00000397.js
1d5c822f6ef1c6b42d1bb9c6326a6c2250cec5256f503f2f8dfa4deeafee373f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x397 1782 bytes
Detection
ClamAV: Win.Exploit.CVE_2010_4091-1
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
stream_010_off00002ce5.js
3d039036d104da22e5b3576174e1b6491c368ef552257cc9a277ac51699369a0		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2CE5 1734 bytes
Detection
ClamAV: Win.Exploit.CVE_2010_4091-1
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
objstm_0019_00.bin
e565ef2d8652b8f0c919c0bd10b06dc6e6f813508cec905ac8ad1125bb7dbff6		 pdf-objstm-decoded PDF /ObjStm 19 0 obj (inflated) 306 bytes
objstm_0030_00.bin
ef1e9ba78224e46cf9abcf35c1fc11d093f1acf023aafc9927b26fc24a52fc91		 pdf-objstm-decoded PDF /ObjStm 30 0 obj (inflated) 32 bytes

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