PDF / .1 malware analysis — malicious · 384eb1858756e4c0

MALICIOUS

PDF / .1

6.6 KB Authoring application: Jganbo

MD5: 4f62a33675245408f9f1cc90b0b07a99 SHA-1: 5903090a0fb703c5043bfca5a3783c4a93f98eb2 SHA-256: 384eb1858756e4c0eddbdac682fc6f7f303c3f86934022dafe7f6ab36557c67c

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The JavaScript stream, identified as 'javascript_obj0018_000.js', appears to be obfuscated, as suggested by the PDF_UNESCAPE and PDF_FROMCHARCODE firings. This script is likely responsible for exploiting PDF vulnerabilities to execute further malicious code or download a second-stage payload. The document body content is largely unreadable, but the presence of obfuscated JavaScript is a strong indicator of malicious intent.

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_obj0018_000.js` `0215209a3dfc72e24e7938bd14a8460ba55a7aa4741bef2305cbdc08fc49e393`	pdf-javascript-stream	PDF /JS object 18 at offset 0x164F	363 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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