PDF malware analysis — malicious · bc73a13de646de1a

MALICIOUS

PDF

1.9 KB

MD5: abc36f3277bf901210de7d5fb261d0e7 SHA-1: b9d10be30ead9ac065871bc20ac9c6753536b168 SHA-256: bc73a13de646de1a823dea74a1c8e538aaaf03f302d2836858cb58725b542f1d

66 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings related to PDF JavaScript and JS streams. The JavaScript stream, identified as 'javascript_obj0005_000.js', likely contains obfuscated code designed to download and execute a secondary payload. The presence of `unescape()` and `String.fromCharCode()` calls further suggests code obfuscation aimed at evading detection.

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` `b295d5a51bcc1a602c25d15689fd001620cbee0277d3f438b3fc5b0d2244756d`	pdf-javascript-stream	PDF /JS object 5 at offset 0x156	5773 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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