PDF malware analysis — malicious · e1d8dc7c3b63c230

MALICIOUS

PDF

14.5 KB

MD5: 5ee8e6621b415b030c4511b7e5746dc0 SHA-1: 0dbbd84ecc8a870076561490b1bd0893a895bd71 SHA-256: e1d8dc7c3b63c2306c29a72a9f9609ae6b249271189b4ed5b844aac4e2d450c4

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1059.003 Command and Scripting Interpreter: Windows Command Shell T1204.002 Malicious File: User Execution: Malicious File

The PDF contains embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream utilizes `eval()` and `String.fromCharCode` for obfuscation, a common technique for malicious scripts. The `CLAMAV_DETECTION` rule `Pdf.Exploit.Dropped-94` strongly suggests this PDF is designed to exploit vulnerabilities and drop further malware. The extracted artifact `javascript_obj0076_000.js` is also flagged as suspicious due to script obfuscation. The primary intent appears to be the execution of obfuscated JavaScript, likely to download and execute a second-stage payload.

Heuristics 6

ClamAV: Pdf.Exploit.Dropped-94 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Dropped-94
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.
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_obj0076_000.js` `c28effae366bd4b2a63fe29aea090a07947ae4e73aa9efc1cf87e16e006e7288`	pdf-javascript-stream	PDF /JS object 76 at offset 0x389A	144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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