PDF malware analysis — malicious · 85edcc39dd96ef89

MALICIOUS

PDF

4.7 KB Authoring application: Fogohadodavejiqa (via 475d6Jigisewoue)

MD5: f514f550bf5b06d471de7caf342da958 SHA-1: 3236e3d9a717b3e96765458906cf0081bdb00104 SHA-256: 85edcc39dd96ef89c8fbd9b50347de7a32e40d153b151ec5701ebd4a2edb41d8

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript that utilizes eval() and obfuscation techniques, as indicated by the 'PDF_JAVASCRIPT', 'PDF_JS', 'PDF_EVAL', and 'PDF_PAGE_WORD_XOR_EVAL_STAGER' heuristics. The ML classifier also flagged it as malicious with high confidence. The extracted JavaScript file, 'javascript_obj0010_000.js', is likely responsible for executing the malicious payload. The obfuscated nature of the script prevents a more detailed analysis of its specific actions, but the presence of eval() and stager techniques strongly suggests it's designed to download and execute further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
Page-word XOR JavaScript eval stager high PDF_PAGE_WORD_XOR_EVAL_STAGER

PDF JavaScript enumerates rendered page words with getPageNthWord/getPageNumWords, extracts encoded byte fragments, XOR-decodes the stage with char-code helpers, and evals the result. This is an old exploit-kit staging pattern and is not normal document JavaScript.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0010_000.js` `f927d745a5f88bd25577c1ca5989364febb11ae7e2090c66669d4b594919741c`	pdf-javascript-stream	PDF /JS object 10 at offset 0xDE7	496 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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