PDF malware analysis — malicious · 3259c7954a1445e9

MALICIOUS

PDF

4.0 KB

MD5: 9865037dafef514707b1b6b50e63889c SHA-1: f7bf6c2428007ed3fa2d16fd6af8df2579ffcb77 SHA-256: 3259c7954a1445e99da5c034f450febbd05620c5367d81fe4801edfcdb0b73c8

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1059.007 JavaScript/JScript

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The `eval()` call and `String.fromCharCode` usage within the decoded JavaScript stream suggest obfuscated code execution. Two JavaScript files, `acroform_b64_00.js` and `javascript_obj0013_001.js`, were extracted, with one being a deobfuscated version. The presence of these elements strongly suggests the script's purpose is to download and execute a secondary payload, a common technique for malware delivery.

Heuristics 5

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)
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_obj0013_001.js` `f4d1717692fdd60f05ea670fe0c262b02fd4a03d4a7368b4d98450d0bdef0149`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6413 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `92032be1c71fc20d9446b60f4641ccb2d9bc94861ac078f75e33abdf391217cd`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3655 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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