Malicious PDF — malware analysis report

Static analysis result for SHA-256 52117e8e5b26695b…

MALICIOUS

PDF

39.9 KB
MD5: 5af59f094ac47afc5804386652b5090b SHA-1: d2cb018aff75c79cb4bbcf3a2a9a1ec86fc3559a SHA-256: 52117e8e5b26695bb2b3573b839ea375388fab8b9c5dcdbe65caec81599d2847
198 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The sample is a PDF file that contains embedded JavaScript, triggering critical heuristics for CVE-2009-4324 (media.newPlayer) and ClamAV detection (Win.Trojan.Agent-36169). The embedded JavaScript, particularly in legacy_pdfkit_stage_000.js, appears to be designed to download and execute a second-stage payload. The reconstructed string "v"+ggJupkslxa89[3]+"r XKdffPfmCj15 = /"+ggJupkslxa89[7]+ggJupkslxa89[8]+ggJupkslxa89[8]+"/"+ggJupkslxa89[9]+ggJupkslxa89[10]+";" suggests the construction of a URL for payload retrieval.

Heuristics 6

  • 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)
  • ClamAV: Win.Trojan.Agent-36169 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Agent-36169
  • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_000.js
16a3586b6d070ee95eccbedecaf83a009e3bf79f5498c454fca85229c29ed4eb		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 2019 bytes
Detection
ClamAV: Win.Trojan.Agent-36169
Obfuscation or payload: unlikely
legacy_pdfkit_stage_000.js
4e225c059cd17abe33884c93d6a7bd250aa680bbb866e1b3f1f0fd18974150d6		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0x9FE 2534 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
legacy_pdfkit_stage_001.js
42025b552c7960b53abcd8cd732b01c8d109eccfdfefc352b9826c4d5807d414		 deobfuscated-js cross-stage annotation API aliases at offset 0x1E7 81 bytes

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