PDF malware analysis — malicious · b7938c1528d10114

MALICIOUS

PDF

20.1 KB

MD5: 019f6530184d93ab9b93e80144c5f55f SHA-1: 6f158286ea494b9b0b50fa66f3ace0db9b7c99a8 SHA-256: b7938c1528d1011421e4c89f0f14d8fd3831077a0475e35ba4cf23e700b8ec09

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains obfuscated JavaScript, indicated by multiple PDF-specific heuristics including `PDF_JAVASCRIPT`, `PDF_JS`, `PDF_EVAL`, and `PDF_FROMCHARCODE`. The ClamAV detection `Heuristics.PDF.ObfuscatedNameObject` further confirms its malicious nature. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, a common technique for initial access and further infection.

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` `a56a53d04a45d4d08b4cdf12e4582779fcabde617fc236a3199c2f822bcdc81a`	pdf-javascript-stream	PDF /JS object 5 at offset 0x156	19957 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0005_001.js` `353d8413e6faf054c5d4f794625f8f814421797456fa80d56a7e603b7bcb39c0`	pdf-javascript-stream	PDF /JS object 5 at offset 0x156	51 bytes

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