PDF malware analysis — malicious · 910fbbda3d872fe2

MALICIOUS

PDF

20.2 KB

MD5: 68cd596015626672df077f5d2d1fdb28 SHA-1: 5aaab726731951992462a62264cb1af03b7080d8 SHA-256: 910fbbda3d872fe2412853db7f7cd7c52b2b39169abe0991e37134993196a88f

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ClamAV detection for Heuristics.PDF.ObfuscatedNameObject further supports its malicious nature. The JavaScript likely attempts to de-obfuscate and execute a payload, as suggested by the use of eval() and String.fromCharCode. The differential parser failure also points to intentional 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` `c2de82a619c8f41f01e6d9639a763bd07b10bea7428747ddd33cf083958f6871`	pdf-javascript-stream	PDF /JS object 5 at offset 0x15A	20087 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0005_001.js` `1327ac061947decd95dd7384fea838a7957c61d9f836745d1c0d504203159f12`	pdf-javascript-stream	PDF /JS object 5 at offset 0x15A	45 bytes

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