Malicious PDF — malware analysis report

Static analysis result for SHA-256 4927a45abd7269f8…

MALICIOUS

PDF

2.6 KB
MD5: 5dc77a9e3c1244a1114775de59a0a3f2 SHA-1: 9710e74f7efeac608ad8fa3d01e3963fb958766c SHA-256: 4927a45abd7269f8026f86d1e451928f01ca7b747062d8e76a3d1f763ed3d8c8
276 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: Malicious File

This PDF file contains embedded JavaScript that utilizes the unescape() function and a printf() call indicative of CVE-2008-2992. The embedded JavaScript streams, when analyzed, suggest an attempt to download and execute a secondary payload. ClamAV detection further supports its malicious nature, identifying it as Win.Trojan.Agent-36168.

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
  • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0007_000.js
03e33dc7f74a360981ac694bc041aa33762024a3df4f0872aa5caa489c987983		 pdf-javascript-stream PDF /JS object 7 at offset 0x2A5 1662 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
773353d4d6e3474a6b6da840337cf2fc00865ad8c95452a864a1503812a2be58		 pdf-javascript-stream PDF /JS object 7 at offset 0x2A5 799 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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