PDF malware analysis — malicious · 1aba9a8b13595801

MALICIOUS

PDF

52.2 KB Created: 2012-11-14 20:03:28 +04:00 Authoring application: Journalspace.com (via mPDF 5.0)

MD5: e1b087384000d39a9604216de407ed38 SHA-1: 5c27729bf1c181dbbd299d825a1bdb307e6659c0 SHA-256: 1aba9a8b135958018ab2f7e42cddf73e59f7ea3ac1adbbb467d57d78cc387f6b

68 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, flagged by multiple heuristics as malicious. The ML classifier strongly indicates maliciousness. The extracted JavaScript file, 'javascript_obj0034_000.js', is obfuscated and likely responsible for downloading and executing a second-stage payload. The PDF structure itself does not provide user-facing content, suggesting its primary purpose is to deliver the malicious script.

Machine Learning

Nyx PDF Classifier malicious score 0.9866

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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0034_000.js` `b549138dc1b00ea70ede2671460e6cd42d9e1c3bb812bf9653550df0951c4991`	pdf-javascript-stream	PDF /JS object 34 at offset 0xC8D4	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_002_off00000e76.bin` `ded1520fd68b91798ef4502ba393be29e6762be445da6319489229b957e57958`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xE76	17756 bytes
`font_01_sfnt_off00003c88.bin` `a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x3C88	17892 bytes
`font_02_sfnt_off00006ac8.bin` `4ee4e439b16220e78b319060a3d86ba95cd4b8614522dd4fa1d4df274793c516`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6AC8	18720 bytes
`font_03_sfnt_off00009d55.bin` `e3eeacc5b1f780160b253f248c40fb29e5cb6416f62dd9413712ea70c37f26c9`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9D55	18756 bytes

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