PDF malware analysis — malicious · bbd894d65aeedc10

MALICIOUS

PDF

28.3 KB Created: 2012-09-16 23:24:48 +04:00 Authoring application: Wordpress.com (via mPDF 5.0)

MD5: d25bce037c69b425c8e136eee4ecda8a SHA-1: 2b07d2c81b958bba0475cee56f4ffaa3670a9490 SHA-256: bbd894d65aeedc10e74111f5329aa34ad962fa06cdb3f2f40dd027cd2f10923c

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript, which is obfuscated using unescape() calls. Static triage indicates suspicious artifacts including hex escape obfuscation and script obfuscation. The ML classifier strongly flags this PDF as malicious. 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 0.9995

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_obj0022_000.js` `76d3bb447acd5b45376b0e8b83aa4aa0566d30e3dffb5ca563e124aa7ad84a28`	pdf-javascript-stream	PDF /JS object 22 at offset 0x69AD	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_off00001438.bin` `ded1520fd68b91798ef4502ba393be29e6762be445da6319489229b957e57958`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1438	17756 bytes
`font_01_sfnt_off0000424a.bin` `a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x424A	17892 bytes

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