PDF malware analysis — malicious · 478502e5c817be61

MALICIOUS

PDF

873 B

MD5: 05cff7b7a97929b071a7b84489b8d5df SHA-1: 2a26590455591d107b6493bf745bd332ed5e468c SHA-256: 478502e5c817be61e023b6d4b470c739b08c3babbe61a62818634d9ac1875191

66 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Phishing: Spearphishing Attachment T1204.002 Malicious File Execution: Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The JavaScript stream utilizes unescape() and String.fromCharCode, suggesting obfuscation. This script is likely responsible for downloading and executing a second-stage payload, as evidenced by the suspicious extracted artifact 'javascript_obj0005_000.js'. The overall attack pattern is a malicious PDF leveraging JavaScript to deliver further malware.

Heuristics 5

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_obj0005_000.js` `69efe725a10a54eabc16d322d52c41562b727472550578704a2a8318e80f2412`	pdf-javascript-stream	PDF /JS object 5 at offset 0x156	411 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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