PDF / .TXT malware analysis — malicious · 751999b27deae77d

MALICIOUS

PDF / .TXT

4.7 KB Authoring application: Fogohadodavejiqa (via 5817fJigisewoue)

MD5: 16b1dde4a4484763a7249269dc31652c SHA-1: 0653879c20b5ecfda7eddf9fb2eaa68c269fbcba SHA-256: 751999b27deae77de0d7d532d324ffc636279cd49bdae9212b6fe8fc42eb299a

188 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF sample contains obfuscated JavaScript that utilizes eval() to execute a dynamically constructed string. This script is designed to exploit a known PDF vulnerability, likely to download and execute a secondary payload. The obfuscation and use of eval() are strong indicators of malicious intent, aiming to bypass static analysis and deliver further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

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.
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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