PDF malware analysis — malicious · d5fcbc0ec8320cfb

MALICIOUS

PDF

2.5 KB

MD5: d455225bfd8917c3e2a9e17d4bff650b SHA-1: 3fa432f90214c59f86ec1622b8dfc2d68b8e6a10 SHA-256: d5fcbc0ec8320cfb446d6f6b94ac841a44e11704eb0597ab3867d073e688d0e8

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier also flagged it as malicious with high confidence. The JavaScript employs `eval()` and `String.fromCharCode()` functions, suggesting obfuscation and dynamic code execution. This pattern is commonly used to download and execute further malicious content. No specific family could be identified.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0004_000.js` `bd7f504d18eb06d7499eba16777808fb8428d21d168ed95f6856140b2acea9d7`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	298 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`stream_001_off00000351.js` `39eda7482563e23eb524e6e7ad2bd3b4dd015903750643eee1591fda20a34cf4`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x351	310 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `f978996d30c9bc74b9014c66e1d9a192b5d0cd8a84c2e062ea0dd2773ee097f9`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x468	1799 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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