PDF malware analysis — malicious · 25263dba7a505b80

MALICIOUS

PDF

827.8 KB Created: 2010-09-02 10:18:12 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: b8da42a82f2938edf4cf3368581025ec SHA-1: 9bb5db527073b9e47818c3d27adaf02e584e5941 SHA-256: 25263dba7a505b80040646b838233d7093ac29857b54e120a85be04d9cfd4b41

74 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The presence of `eval()` and `String.fromCharCode` suggests obfuscated JavaScript code. This script is likely designed to download and execute a secondary payload, a common technique for initial access. No specific family could be identified.

Heuristics 6

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. (matched inside decoded stream)
AcroForm button with action trigger low PDF_ACROFORM_BUTTON

PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0082_000.js` `4ac797e442fbfdd5ad383c4c11efd45c72cc36ee621d1809cc3ae572d5fc15b1`	pdf-javascript-stream	PDF /JS object 82 at offset 0x9C712	25637 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 120 long base64-like blob(s).
`stream_000_off00000747.bin` `630c83668a9ad193903209bd467cf804ff857515b4541e169ccf08430d3a801c`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x747	828152 bytes

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