PDF malware analysis — malicious · 05562555c60c39a6

MALICIOUS

PDF

28.4 KB Created: 2012-06-28 16:16:12 +04:00 Authoring application: Drupal.org (via mPDF 5.0)

MD5: 48bc9ccf3b50ecd1489b59ad2494e65c SHA-1: 24041fd377166f7793935cbeb256db1dd21801a1 SHA-256: 05562555c60c39a690bd0c2d9794c058d34d60f362ac124267ff91715d57b933

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 utilizes the unescape function to decode a URL. This URL, 'http://safesearchresults.com/in.cgi?17', is then passed to getURL, indicating an attempt to redirect the user to a potentially malicious site. The presence of exploit cluster heuristics and ML classification further supports its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9994

Heuristics 7

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.
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.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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.
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.
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://safesearchresults.com/in.cgi?17
- http://dejavu.sourceforge.net
- http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0022_000.js` `1793781740f4c7b9fbf0c518eba06e6e11bd0c098a6ebed4ba954e1e730dcd7c`	pdf-javascript-stream	PDF /JS object 22 at offset 0x6A4B	139 bytes
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).
`stream_003_off000014a2.bin` `4056ebfe3787e8014d280a1c1758194f27ba9894cd4d5103b3e304c7c49fa759`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x14A2	17832 bytes
`font_01_sfnt_off000042e8.bin` `a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x42E8	17892 bytes

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