PDF malware analysis — malicious · 91f0d35a1073a199

MALICIOUS

PDF

4.0 KB

MD5: 9c149441d164fec76e1d73c8a84879ae SHA-1: b546fcebae2005dbecdee3cd3896fd19118dd143 SHA-256: 91f0d35a1073a199cfb1f197221bde9db11185f7fb176cd597f497cc0cbb6970

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file was flagged by a machine learning classifier and ClamAV as malicious (Pdf.Dropper.Agent-7283123-0). Static analysis revealed embedded JavaScript streams, including one that uses eval() and String.fromCharCode, indicating obfuscation. This JavaScript is likely responsible for downloading and executing a second-stage payload, a common technique for PDF-based malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7283123-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7283123-0
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `a87e6a9fd267ce005d1d6df7b4db5f97f8694c9ae3554ad3ec0f59f157f69380`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6317 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `c8e1bd79ad150b65d73c9e2780196d5aea982105b73646f938e3034c55708786`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3584 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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