Malicious PDF — malware analysis report

Static analysis result for SHA-256 894e85da21814245…

MALICIOUS

PDF

2.7 KB Created: 2008-31-20 53:85:00 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)
MD5: 58077181b79ffba70b0a1e10ba13c885 SHA-1: 50a4cba05b16da11a10b5e7fb947ab41186f6863 SHA-256: 894e85da218142459e864aae3bbcb710cdaa5d5171d12b024466d487575eb744
376 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript that is triggered by the 'OpenAction' directive, exploiting CVE-2007-5659 (Collab.collectEmailInfo) and CVE-2008-2992 (util.printf). The embedded JavaScript stream, identified as 'javascript_obj0013_001.js', is heavily obfuscated but likely serves to download and execute a secondary payload, as indicated by the ClamAV detection of 'Win.Trojan.Agent-36168' on both the PDF and an extracted artifact. The use of JavaScript actions and specific CVE exploits points to a common PDF-based malware delivery technique.

Heuristics 9

  • Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659
    PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (matched in decompressed stream)
  • 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)
  • 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.
  • OpenAction trigger high PDF_OPENACTION
    PDF has an /OpenAction — code runs automatically when opened
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • Suspicious extracted artifact high 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.
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0013_001.js
792074ad5adb7563ebee464d087728b489f885a64fccc074dcbdfb126ddc9e80		 pdf-javascript-stream PDF /JS object 13 at offset 0x3FD 3129 bytes
Detection
ClamAV: Win.Trojan.Agent-36168
Obfuscation or payload: likely
Carved artifact contains 6 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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