Malicious PDF — malware analysis report

Static analysis result for SHA-256 744315818f465a0e…

MALICIOUS

PDF

6.3 KB
MD5: 6bdacb02d62ddfb38dc541f023bf4310 SHA-1: 4ac73c8506a8d5b1ea0b6e703bb238bb2fbbaf90 SHA-256: 744315818f465a0ea75f878fc71f33745d4323603a80d0356b5e501f22dd23a2
150 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, flagged by multiple heuristics as malicious and indicative of an exploit. The ML classifier strongly suggests maliciousness. The JavaScript likely attempts to exploit a known PDF vulnerability to execute arbitrary code. No specific family could be identified, and no external IOCs like URLs or domains were found.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 5

  • JavaScript action low 2 related findings 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)
  • 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.
  • 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# In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00000324.bin
c9ee388bc0f276eb65e5966c3cdc4adb7c8b0911e1afa867fe905eb74da19b85		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x324 390 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
objstm_0024_00.bin
c10039b4fa2c9e6f2e5237b8f0bf914a741ac1cd5a17036ff9dd3134e57d82d3		 pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 331 bytes

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