Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2cc05274a80bc60…

MALICIOUS

PDF

42.1 KB Created: 2010-06-21 11:37:05 Authoring application: Microsoft® Office Word 2007
MD5: ab0de6579a13226fa71ca44ad61d91e3 SHA-1: fa8050bed191b3132cffce65be5414b717e58183 SHA-256: b2cc05274a80bc60574e6dbf13ee66a4437fb3150a400d22196110864bd85599
246 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript T1204.002 Malicious Link/URL

This PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. The critical 'CVE_2008_2992' firing suggests exploitation of a vulnerability related to 'util.printf'. The embedded JavaScript stream, identified as 'javascript_obj0025_000.js', is likely responsible for executing malicious code. The ClamAV detection of 'Win.Trojan.Agent-36168' further confirms the malicious nature of the file and its extracted components.

Heuristics 8

  • 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.
  • Additional-actions dictionary low PDF_AA
    PDF defines /AA (Additional Actions) that references an executable action (JS/JavaScript/Launch/SubmitForm) — can auto-trigger on document or widget events. Form-field calc/format/validate/keystroke handlers in legitimate interactive forms commonly fire this, so it is reported as a low-weight signal; weaponised auto-execution is flagged by stronger rules (PDF_OPENACTION, encrypted-with-JS, etc.)
  • 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_obj0025_000.js
b7e5e000d6e473119b2de09b9bd79527b8d0ba3dc93f448126d39b05f8524bb1		 pdf-javascript-stream PDF /JS object 25 at offset 0x9E82 1843 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).

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