PDF malware analysis — malicious · fecb2d3cc260775a

MALICIOUS

PDF

40.0 KB

MD5: 6722edf45a277323ff90b9bd5a7c9857 SHA-1: f0d79d2e64fb77ddb42ed0055118adb7b993ddcb SHA-256: fecb2d3cc260775a4850759df9fe59883b826b08640f0c095ef6faa5529a5652

126 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 presence of a critical PDF_EVAL heuristic and the use of String.fromCharCode suggest obfuscation. The extracted JavaScript file, javascript_obj0005_000.js, is likely responsible for executing malicious code, potentially downloading a second-stage payload. The ClamAV detection of 'Heuristics.PDF.ObfuscatedNameObject' further supports the malicious nature of the file.

Heuristics 6

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.
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` `7db5a087b205c152bb5efadc28eca5324f9d398af57203a8628e4589901f088d`	pdf-javascript-stream	PDF /JS object 5 at offset 0x169	40364 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0005_001.js` `5db6996680c1087dc49ea4c388b99724b13e1c3686d874a4d823032e122e6982`	pdf-javascript-stream	PDF /JS object 5 at offset 0x169	53 bytes

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