PDF malware analysis — malicious · 9f5b9a316d48263b

MALICIOUS

PDF

28.3 KB Created: 2012-09-22 12:18:23 +04:00 Authoring application: Wordpress.com (via mPDF 5.0)

MD5: 177157b97f9027d2699a4aec179e339d SHA-1: aacee21dcfc9b0d858af9d26a48a1fdba3c7597b SHA-256: 9f5b9a316d48263b89fc8bdc05bf1567b9db4c45476bd630c16275147dbc1cc3

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1566.002 Spearphishing Attachment T1140 Deobfuscate/Decode Files or Information

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. The 'PDF_UNESCAPE' heuristic suggests that the JavaScript content is obfuscated, and the ML classifier strongly flags the PDF as malicious. The presence of obfuscated JavaScript within a PDF is a common delivery mechanism for downloading and executing further malicious content. No specific family could be identified, but the techniques used point towards a downloader or dropper.

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` `be63095b36d2a7a6bb2354eee6ea8f866bd67eb57984a872fcac65a5a9d7a885`	pdf-javascript-stream	PDF /JS object 22 at offset 0x69E6	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_off00001471.bin` `ded1520fd68b91798ef4502ba393be29e6762be445da6319489229b957e57958`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1471	17756 bytes
`font_01_sfnt_off00004283.bin` `a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4283	17892 bytes

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