PDF malware analysis — malicious · fa27db5ec3962605

MALICIOUS

PDF

29.2 KB Created: 2012-12-10 16:18:41 +04:00 Authoring application: Java.net (via mPDF 5.0)

MD5: 99deee149b51dd6a781dbd0accab10fc SHA-1: 8029eaeeaaedbdb4bb426e5165690613ece054d0 SHA-256: fa27db5ec3962605ab05910cc783f1005e27e2feec2c71393b1f45bcfb3edd3b

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, flagged by multiple heuristics, including a high-severity ML classifier. The JavaScript stream, identified as 'javascript_obj0024_000.js', is obfuscated and likely responsible for downloading and executing a second-stage payload. The ML classifier's high confidence score further supports the malicious nature of this PDF.

Machine Learning

Nyx PDF Classifier malicious score 0.9993

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` `cd6097ae9725eedeb8d68162b4d969180785ce4cb6006439670b9637b33de890`	pdf-javascript-stream	PDF /JS object 24 at offset 0x6DD5	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_off00001860.bin` `ded1520fd68b91798ef4502ba393be29e6762be445da6319489229b957e57958`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1860	17756 bytes
`font_01_sfnt_off00004672.bin` `a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4672	17892 bytes

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