PDF malware analysis — malicious · 03a82baca349e8d9

MALICIOUS

PDF

29.0 KB Created: 2011-01-14 00:19:30 +02:00 Authoring application: http://google.wiki.usfca.edu/ (via mPDF 5.0)

MD5: 60303312573f7080a8c6ea6e0cd2ccb0 SHA-1: 5a113db950243d90c2535c60f6a84751b364a9a0 SHA-256: 03a82baca349e8d932c5a2313c9bd86ac890974511be428b10722843f8ef5c5b

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://searchglobalsite.com/in.cgi?17', is then accessed via getURL, indicating an attempt to redirect the user to a potentially malicious site. The ML classifier and exploit cluster heuristics strongly suggest this PDF is designed to exploit vulnerabilities for client execution.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

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://searchglobalsite.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` `a2620a0be21a26956e8296a3c8163c8c260cb6a920586f15a19c6e170ac30940`	pdf-javascript-stream	PDF /JS object 22 at offset 0x6D35	136 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_off00001789.bin` `418d4a36fb5d40ce7f2aabe0f344dfd1e757be126b7469883f65fd4d7255c462`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1789	17844 bytes
`font_01_sfnt_off000045d2.bin` `a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x45D2	17892 bytes

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