PDF malware analysis — malicious · 7d3f18cea7fe51c7

MALICIOUS

PDF

22.6 KB

MD5: 7fb12c5c3255b8188a30462d1738074f SHA-1: 59793b27b2a2038a28622cb907c6510acec3e8a3 SHA-256: 7d3f18cea7fe51c70fe35e71ca75aad5e42f22bc2e91ad9d2c84e3da3cbb8f2d

94 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1059.003 Command and Scripting Interpreter: Windows Command Shell T1059.007 Command and Scripting Interpreter: JavaScript/TypeScript

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings related to PDF JavaScript and decoding filters. The JavaScript stream, named 'javascript_obj3332_000.js', is likely responsible for executing malicious code. The use of unescape() and String.fromCharCode suggests obfuscation techniques common in malware delivery. The extracted artifact 'javascript_obj3332_000.js' is the primary IOC.

Heuristics 7

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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)
ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85

ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
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_obj3332_000.js` `cb9b9d25fac45af8acf5581013b50b83ff981546116f35d9f693d8edc7b732ff`	pdf-javascript-stream	PDF /JS object 3332 at offset 0x575D	482 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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