PDF malware analysis — malicious · ff3e3eb6efac1cbe

MALICIOUS

PDF

30.4 KB Created: 2009-05-01 21:21:45 Authoring application: ghjkSFghjkCPx (via afdsdgf)

MD5: 9b34a7b1ca8fc385b18aaa145e1eb4cb SHA-1: c0ca97c46c3369ee28986d48ffc6b5a2d35f0365 SHA-256: ff3e3eb6efac1cbec62044e7b97c7c219deff901f53ff5ac8860ed1b6e9129fc

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly indicates maliciousness. The JavaScript uses eval() calls and string concatenation to obfuscate its actions, making it difficult to fully deobfuscate. However, the presence of eval() and the ML score suggest it's designed to download and execute a second-stage payload. The reconstructed string 'tp.split('@')' is likely part of the deobfuscation or payload retrieval mechanism.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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.
Suspicious extracted artifact info 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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `9c9e832de1de65d8cf42a0a44bc27d13b61d78a7d8e3c1cce3414a59373ed529`	pdf-javascript-stream	PDF /JS object 7 at offset 0x21C	29938 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`javascript_obj0007_001.js` `4216634e64024e938549396e663f2fef91e1257526b0a1b554cce269d5955653`	pdf-javascript-stream	PDF /JS object 7 at offset 0x21C	28972 bytes

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