Malicious PDF — malware analysis report

Static analysis result for SHA-256 1284cdc20e84c4a3…

MALICIOUS

PDF

6.1 KB
MD5: b1c2cb607f5044a9819a5666ca81c372 SHA-1: 4df577a1ffada0ad0c0495d170c1a4d5b864bcab SHA-256: 1284cdc20e84c4a3972eeecc241fe2ca0ef87decccb33a5da5b064373bef77ee
110 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript and triggers a critical heuristic for CVE-2008-2992, indicating exploitation of a known vulnerability. The JavaScript action is likely intended to download and execute a secondary payload, a common technique for initial compromise. No specific family could be identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 5

  • util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992
    PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (matched in decompressed 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_off00000323.bin
da2484e4745a20dd920baf11eef1de89312f3e2695cc9df6f4f15f04981c01ca		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x323 339 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
objstm_0024_00.bin
552bf35fb62469b385ccc793d861f60c4d00fbf299af09c027efb3d1cec44814		 pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 331 bytes

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