PDF malware analysis — malicious · f1daa9a3aa82c937

MALICIOUS

PDF

4.0 KB

MD5: 6bacdded71414c49378b049853be8eb7 SHA-1: c0a05f9cc22951c95deddf69ea51fc87b4ec75ba SHA-256: f1daa9a3aa82c9372c483c27823d72c4b84bf71f7baa0caa0ac056b6db90b0b1

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The presence of `eval()` and `String.fromCharCode` suggests obfuscated code execution. ClamAV detected this as Pdf.Dropper.Agent-7322950-0, a known dropper. The embedded JavaScript streams, particularly `acroform_b64_00.js`, are likely responsible for downloading and executing a second-stage payload, although the exact mechanism is obfuscated.

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7322950-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7322950-0
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` `c2ab94e38e8e1685303e00d16190679cc5fb55c20992eaa3205f0be4901e6ea4`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6281 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` `afa2faf1143c3d2c7217a51d93a3281044c3f71ed1d81e76fa02220c1238b086`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3557 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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