PDF malware analysis — malicious · 959d5911594e5315

MALICIOUS

PDF

879 B

MD5: 5ca4a7889f581da40ef15b4a429158a1 SHA-1: 52f88a5a40202a13808ab1f235895cb337f40b67 SHA-256: 959d5911594e531554469834405d27c049379db489e252ac69bc5c19e820b597

66 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings related to PDF JavaScript actions and streams. The JavaScript stream, identified as 'javascript_obj0005_000.js', is likely responsible for downloading and executing a secondary payload. The use of unescape() and String.fromCharCode functions suggests obfuscation techniques commonly employed to hide malicious code.

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` `0da18bf93df3cf8772ff2e83ee576b1b475565c3321977f71f3a6ec08f9772f3`	pdf-javascript-stream	PDF /JS object 5 at offset 0x156	451 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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