PDF malware analysis — malicious · f0f2cb82a9e65e0a

MALICIOUS

PDF

30.7 KB

MD5: 6bbb9e93eeba6df72ea69db946823439 SHA-1: 3b8eae4b9a8cee34bf113294480467b4accb80c3 SHA-256: f0f2cb82a9e65e0a93e024f23f8c8eafcf63e421a981f2c23fdbae747bc0172a

114 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1027 Obfuscated Files or Information T1204.002 Malicious File

The PDF contains embedded JavaScript, which is heavily obfuscated using `eval()` and `unescape()` calls. The script also utilizes `String.fromCharCode` and string concatenation, further obscuring its functionality. The presence of these obfuscation techniques and the execution of JavaScript within a PDF strongly suggests the intent to download and execute a secondary payload. The extracted JavaScript files are named 'javascript_obj0003_002.js' and 'javascript_obj0006_007.js'.

Heuristics 7

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
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.
Additional-actions dictionary low PDF_AA

PDF defines /AA (Additional Actions) that references an executable action (JS/JavaScript/Launch/SubmitForm) — can auto-trigger on document or widget events. Form-field calc/format/validate/keystroke handlers in legitimate interactive forms commonly fire this, so it is reported as a low-weight signal; weaponised auto-execution is flagged by stronger rules (PDF_OPENACTION, encrypted-with-JS, etc.)
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_obj0003_002.js` `f32257954d2d2efc494ede5607a1cf6348f8819fe93b4c4170d672e7887741fe`	pdf-javascript-stream	PDF /JS object 3 at offset 0xDA	87 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0006_007.js` `d42b75d4cc06956b4418a6a68f53e3d8936ab641c3d8efea824adbdd25cbfe77`	pdf-javascript-stream	PDF /JS object 6 at offset 0x3C9	30206 bytes

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