PDF malware analysis — malicious · c2a89db674203b4b

MALICIOUS

PDF

2.3 KB

MD5: a5c48c801245046eeab4976f1cc41cff SHA-1: 3d738ab6f81e26d257e48930403f71cf3564bba2 SHA-256: c2a89db674203b4b7afc098f2e5f08f891ea5364256bfb46c7f63835197fd0f2

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript, which is heavily obfuscated using eval() and unescape() calls. The deobfuscated JavaScript, found in legacy_pdfkit_stage_000.js, appears to be responsible for downloading and executing a second-stage payload. The presence of multiple JavaScript-related heuristics and the suspicious nature of the deobfuscated script indicate a downloader or dropper functionality. The exact download URL or execution command could not be confidently reconstructed due to the obfuscation.

Heuristics 6

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111611_000.js` `e7d1232c16a6e584ebcad6ed89ed39659361935894de0b1df6aee2e4fe16ce04`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x7E8	478 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `fa3bcad239b0221492cbb7623faffe81a670ec3822fdbb300d18f5c89d89ec60`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x189	2840 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

Open this report in the interactive analyzer, or submit your own file for analysis.