PDF malware analysis — malicious · d4b1ebed78bf13bf

MALICIOUS

PDF

14.0 KB

MD5: 1090790d8f38e31f16595933ae06fe77 SHA-1: b70d0a4b903dadd1d950cca3d8085999c7421ba2 SHA-256: d4b1ebed78bf13bf4bd20f84046d7589bdf3882556e3f38f22dabbae3b46d84d

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information

The PDF file exhibits multiple heuristic firings related to JavaScript obfuscation and execution, including ClamAV's detection of 'Heuristics.PDF.ObfuscatedNameObject'. An embedded JavaScript file was extracted, which likely contains code to download and execute a secondary payload. The obfuscation suggests an attempt to evade detection.

Heuristics 5

ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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. (matched inside decoded stream)
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `b5b118f0569ad2170850bba12eaee51120486366b43108923edf9eb84d03369f`	pdf-javascript-stream	PDF /JS object 6 at offset 0x197	14194 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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