PDF malware analysis — malicious · 892fa07126ad4979

MALICIOUS

PDF

41.2 KB Created: 2012-09-15 11:30:07 +04:00 Authoring application: Wordpress.com (via mPDF 5.0)

MD5: bc1c4d5c342eed2489fdea5c7bfbd08b SHA-1: 910c68d5371edc13cbd5249c9ff1891c97b434af SHA-256: 892fa07126ad49793845e5e23457fc8f53b028b9f34ca15fd166c240fe506c8d

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, flagged by multiple heuristics as suspicious and malicious. The ML classifier assigned a high probability of maliciousness. The extracted JavaScript file, 'javascript_obj0029_000.js', exhibits obfuscation, suggesting it is designed to download and execute a secondary payload. The exact nature of the payload cannot be determined due to obfuscation, but the presence of JavaScript actions and streams points to a downloader or dropper attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9984

Heuristics 3

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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0029_000.js` `cd6097ae9725eedeb8d68162b4d969180785ce4cb6006439670b9637b33de890`	pdf-javascript-stream	PDF /JS object 29 at offset 0x9C15	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_off0000141a.bin` `ded1520fd68b91798ef4502ba393be29e6762be445da6319489229b957e57958`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x141A	17756 bytes
`font_01_sfnt_off0000422c.bin` `a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x422C	17892 bytes
`font_02_sfnt_off0000706c.bin` `4ee4e439b16220e78b319060a3d86ba95cd4b8614522dd4fa1d4df274793c516`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x706C	18720 bytes

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