Malicious PDF / .PHP — malware analysis report

Static analysis result for SHA-256 fea5bdca2ed86f99…

MALICIOUS

PDF / .PHP

228.6 KB
MD5: 1797f6809278d763805991282ba659cb SHA-1: ee9d87b79d776ce2675c240e59b42c36ff27201a SHA-256: fea5bdca2ed86f999dc6a96e135253a476ec5626db11cb1eb708c47207994cdf
258 Risk Score

Malware Insights

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

The sample is a PDF file that leverages multiple critical vulnerabilities (CVE-2009-0927, CVE-2007-5659, CVE-2008-2992) by executing embedded and obfuscated JavaScript. This JavaScript is further identified as malicious by ClamAV (Js.Exploit.Shellcode-18). The primary intent appears to be the execution of a second-stage payload, as indicated by the 'legacy_pdfkit_stage_000.js' artifact.

Heuristics 7

  • 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)
  • 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. (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_obj0008_000.js
97be82231fa3d3e37c3a14c138f64a021f08e425d06e51345592b2363b20bbad		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 3399 bytes
legacy_pdfkit_stage_000.js
2b4497ec839731a18c551130c93233da032854ec438e6fd0b286713adfe20bce		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0xF62 10946 bytes
Detection
ClamAV: Js.Exploit.Shellcode-18
Obfuscation or payload: likely
Carved artifact contains 11 eval/decoder/string-building token(s).

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