PDF malware analysis — malicious · 3eeb8a372adc3e69

MALICIOUS

PDF

36.9 KB

MD5: 826351c5280c5c299522b7904ee6c6ac SHA-1: 819878670979f2d3fb23b70da05be308fc1e5d78 SHA-256: 3eeb8a372adc3e69859fec76a634926faf419f99b0562802a7081ca5829ebe0c

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream is heavily obfuscated, utilizing `eval()` and `String.fromCharCode()`, as evidenced by the PDF_EVAL and PDF_FROMCHARCODE firings. The ClamAV detection of 'Heuristics.PDF.ObfuscatedNameObject' further supports the malicious nature. The primary intent appears to be downloading and executing a second-stage payload, as suggested by the obfuscated script content and the presence of extracted JavaScript files. The differential parser failure also points to deliberate obfuscation.

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` `712d2c617cbeaccc420c7951db42bbfbb42833b2f429059e5a65c31907799183`	pdf-javascript-stream	PDF /JS object 5 at offset 0x15C	37156 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0005_001.js` `e86c231ed1ca2a11fea684922403c29e77c3920d2b3c42846eafc833bee1b80b`	pdf-javascript-stream	PDF /JS object 5 at offset 0x15C	60 bytes

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