PDF malware analysis — malicious · bf5e2c133df99d08

MALICIOUS

PDF

4.0 KB

MD5: 811ac7a2ff6d320da7fd8403a8c25fd8 SHA-1: 669408824fd65541123c68ba8b5620f9e96bc77c SHA-256: bf5e2c133df99d08d984b1cb748c30c518628d571aecffbd36ad82d49418d802

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, including calls to eval() and String.fromCharCode, indicating obfuscated code execution. The heuristics and ClamAV detection (Pdf.Dropper.Agent-7685822-0) strongly suggest this is a dropper. The embedded JavaScript likely downloads and executes a second-stage payload, which is a common technique for malware distribution.

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7685822-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7685822-0
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` `d1670dc6851bfbe7092e423372a6552512d42633577f5cde104546c64860e276`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6333 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` `deb548ae06e273df8c8dd428ccb2325a08dd77b49eba37a76dd5021eee9ec531`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3595 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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