PDF malware analysis — malicious · c1ab9581259b3c95

MALICIOUS

PDF

29.0 KB Created: 2012-09-22 12:18:12 +04:00 Authoring application: Wordpress.com (via mPDF 5.0)

MD5: a32c4a3ca49b41da0ebb1b1bddbb2269 SHA-1: e6a4ad1a034f911947c05de617cef760f466da22 SHA-256: c1ab9581259b3c95918623e5823a421a5930d092a4b1223fcfafdf653e5cc673

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly flagged this PDF as malicious. The JavaScript stream was obfuscated using unescape(), suggesting an attempt to hide malicious code. The primary attack vector appears to be the execution of this JavaScript, which is likely designed to download and execute a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9994

Heuristics 4

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.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0024_000.js` `be63095b36d2a7a6bb2354eee6ea8f866bd67eb57984a872fcac65a5a9d7a885`	pdf-javascript-stream	PDF /JS object 24 at offset 0x6C1C	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_004_off000016a7.bin` `ded1520fd68b91798ef4502ba393be29e6762be445da6319489229b957e57958`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x16A7	17756 bytes
`font_01_sfnt_off000044b9.bin` `a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x44B9	17892 bytes

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