PDF malware analysis — malicious · 1f6c2bc7fdb6f43f

MALICIOUS

PDF

4.0 KB

MD5: 4c1f3415a6fc058f5344542294059dc4 SHA-1: a382998fd49e6ed5c9a4c3857e63b244c9065184 SHA-256: 1f6c2bc7fdb6f43f2ed2ae646500c76eb8a929fc71dd8b796107981ddb943a37

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

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 designed to execute malicious actions. The ClamAV detection of 'Pdf.Dropper.Agent-7237357-0' strongly suggests this PDF is a dropper. The deobfuscated JavaScript likely downloads and executes a second-stage payload, although the exact URL or execution method is not directly extractable from the provided evidence.

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7237357-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7237357-0
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` `d908ccd9e8aada9770e0d257e2a1e096c2b8fd97e71eccdf78f878a94c7023d6`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6285 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` `61552b71d9fd63cc2e644c112352b0efdf8e33ee2065f76c77c6f9b58828975b`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3561 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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