Malicious PDF — malware analysis report

Static analysis result for SHA-256 bae1447a722521b6…

MALICIOUS

PDF

10.3 KB Created: e1svrt Authoring application: Adsfgddfobe (via sfgasdfgsd)
MD5: 4fabac6ca5f453274b5195829993d4f1 SHA-1: 1b568e17b63b07d8757fc727dafd3b4185e77a2f SHA-256: bae1447a722521b662990728cb3f8206c0580e33c704c1e2b15fcc5c4b510797
258 Risk Score

Malware Insights

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

The PDF file contains multiple critical heuristic firings indicating exploitation of CVE-2009-4324 (media.newPlayer), CVE-2009-0927 (Collab.getIcon), and CVE-2007-5659 (Collab.collectEmailInfo). These vulnerabilities are used to execute embedded JavaScript. An extracted JavaScript file, 'legacy_pdfkit_stage_000.js', was flagged by ClamAV as 'Js.Exploit.Shellcode-18', suggesting it contains shellcode. The overall attack pattern is consistent with a PDF-based exploit kit designed to download and execute a secondary payload.

Heuristics 7

  • media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324
    PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (identified after JavaScript deobfuscation)
  • Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927
    PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (identified after JavaScript deobfuscation)
  • 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. (identified after JavaScript deobfuscation)
  • 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.
  • 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_obj0006_000.js
66c50cc2efcce8ceed66776eaa5cdb81b04090431d7bb70d2f418a0206ab234b		 pdf-javascript-stream PDF /JS object 6 at offset 0x14A 603 bytes
legacy_pdfkit_stage_000.js
c55530cee87cefeb5f296b6db37f800ecfc913668d578da20379aa9015540f94		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0x35A 11359 bytes
Detection
ClamAV: Js.Exploit.Shellcode-18
Obfuscation or payload: likely
Carved artifact contains 12 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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