PDF malware analysis — malicious · 38036f9dc5c1b5a0

MALICIOUS

PDF

70.6 KB

MD5: 2451f84058c8e36940aab724a3e3ce00 SHA-1: dd82d06d2e0773a603f6fda04c5fb00243389f15 SHA-256: 38036f9dc5c1b5a0f0265ff03a35d07b23253b9873b955cd810861ab8957fcc4

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The JavaScript stream is obfuscated, and the presence of eval() and String.fromCharCode() suggests dynamic code execution. This pattern is commonly used to download and execute further malicious content. The extracted artifact 'javascript_obj0006_000.js' is also noted as suspicious. The document body content is a series of encoded numbers, which is not directly indicative of a specific lure but supports the idea of obfuscated content within the PDF.

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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_obj0006_000.js` `4ca4f44826f5d6b2fd7cb6d23abac0282ea69dce5f24784601519f25b7b72faa`	pdf-javascript-stream	PDF /JS object 6 at offset 0x12D	71714 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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