PDF malware analysis — malicious · 28108cd09aace057

MALICIOUS

PDF

20.0 KB

MD5: cfca757b554ae0c0c0434cc3a6059331 SHA-1: 6207e21f97875caa270310cc433c86eb8d07a289 SHA-256: 28108cd09aace05766d489d2f5f89e29088117ea01f51705aaad19f8881a059f

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains obfuscated JavaScript, indicated by the PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL heuristics. The ClamAV detection for Heuristics.PDF.ObfuscatedNameObject further supports this. The embedded JavaScript streams, particularly 'javascript_obj0005_000.js', are likely responsible for downloading and executing a secondary payload, a common technique for initial access. The obfuscation and use of eval() suggest an attempt to evade detection.

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` `426e6b0476c64562cafc0014014ccca6e349d4299d2430218309e0c768943e61`	pdf-javascript-stream	PDF /JS object 5 at offset 0x158	19842 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0005_001.js` `f4dafa9a05497f65908d06cc845f581b06644dd2ae2ddd5e5f160185639fd140`	pdf-javascript-stream	PDF /JS object 5 at offset 0x158	38 bytes

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