Malicious PDF — malware analysis report

Static analysis result for SHA-256 583ef3a1bdad26bf…

MALICIOUS

PDF

2.6 KB
MD5: 36b0518ce1383ff83b320b9f2879219b SHA-1: 9922ed3bd210bfed78262a9aa91bf0427ad4846c SHA-256: 583ef3a1bdad26bf2cc8d625182a76168a1160357aca5c74d529d772adf3091f
238 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. A critical heuristic identified the use of util.printf, which is associated with CVE-2008-2992, a known vulnerability in Adobe Reader. The embedded JavaScript streams, particularly javascript_obj0007_000.js and javascript_obj0007_001.js, likely contain obfuscated code designed to exploit this vulnerability. ClamAV detections of 'Win.Trojan.Agent-36168' on both the main file and an extracted artifact further confirm its malicious nature, suggesting it acts as a downloader or dropper for further malicious activity.

Heuristics 7

  • 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.
  • ClamAV: Win.Trojan.Agent-36168 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Agent-36168
  • 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
  • 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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0007_000.js
c48b144df0df93430f8732f80ad2dc709268a5e388d5f16a74526fa2a4008617		 pdf-javascript-stream PDF /JS object 7 at offset 0x284 1721 bytes
Detection
ClamAV: Win.Trojan.Agent-36168
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
javascript_obj0007_001.js
71e94aa91f17c2c6468c0625392a8541c557eacf87e25fe30b4103b8229aa00b		 pdf-javascript-stream PDF /JS object 7 at offset 0x284 889 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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