PDF malware analysis — malicious · 9ef6e58b279f87da

MALICIOUS

PDF

4.6 KB Created: 2009-05-06 20:45:24 +08:00

MD5: 563e252a2e16ae1035e31104585b1186 SHA-1: 1b7098172cae7097795c570e546a1414e45198da SHA-256: 9ef6e58b279f87da789dbd4a3a41e60dd3f521d2dd5e837c28b8db5a365e5373

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The JavaScript stream is obfuscated using unescape() and String.fromCharCode, common techniques for hiding malicious code. ClamAV detections confirm this is a malicious PDF dropper, likely designed to download and execute a secondary payload. The extracted artifact 'javascript_obj0001_000.js' is also flagged as suspicious.

Heuristics 7

ClamAV: Pdf.Dropper.Agent-7287548-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7287548-0
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0001_000.js` `3ffb265e9bad97c6f70e70c1056568559c9825ff6c755fa86ac369ee6837c32a`	pdf-javascript-stream	PDF /JS object 1 at offset 0xF	5723 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s).

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