PDF malware analysis — malicious · de17c99f2982d0d3

MALICIOUS

PDF

51.0 KB

MD5: f62c79650c21e5f97b52f56d57db15d9 SHA-1: 34cb690a0ed521cb6be556a13ea61f2bdf567273 SHA-256: de17c99f2982d0d38d0b859b953da951562f27c3c7575d04ad5a25f198200da7

158 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information

This PDF file contains obfuscated JavaScript, indicated by multiple PDF_JAVASCRIPT and PDF_JS heuristics, along with a high-severity PDF_EVAL firing. The embedded JavaScript streams, particularly 'javascript_obj0005_000.js', are heavily obfuscated and likely responsible for downloading and executing a secondary payload. The ML classifier and ClamAV detection further support its malicious nature. The exact URL or payload is not directly discernible due to the obfuscation, but the intent is clear.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 7

ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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.
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSEOF. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `ccce74352538d7ffbaee3d2fe2736cbfc63820832ce3616bd1b2510d0ecea874`	pdf-javascript-stream	PDF /JS object 5 at offset 0x164	51626 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0005_001.js` `db34ecadc3137a52569c1aa8864f57fdf2ef5e553d166a8f6144024b70607ff5`	pdf-javascript-stream	PDF /JS object 5 at offset 0x164	61 bytes

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