PDF malware analysis — malicious · 85be2b58879d81d4

MALICIOUS

PDF

4.7 KB Authoring application: Fogohadodavejiqa (via e0e87Jigisewoue)

MD5: 2c474356475708d22f47f5804476f11c SHA-1: 059bf84384cd2ee974908636584d96f40395ac88 SHA-256: 85be2b58879d81d417ccd43c5abef6211e3e1ae7b3d02fb6ca104e0fe33cefe2

130 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains obfuscated JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', 'PDF_EVAL', and 'PDF_PAGE_WORD_XOR_EVAL_STAGER'. The ML classifier also flagged it as malicious with high confidence. The embedded JavaScript, extracted as 'javascript_obj0010_000.js', is likely responsible for downloading and executing a second-stage payload, a common technique for initial access.

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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