PDF malware analysis — malicious · 371203be5ef2e117

MALICIOUS

PDF

5.4 KB

MD5: 96d7ebc5ea681bfc232e490d8f8f8d06 SHA-1: 41fc8581b963724f6b3839fb70ed5a1c3bcc3a00 SHA-256: 371203be5ef2e117b2c5b631118193b7a8fc36a3f5f096543e316a53ff61d94b

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 likely downloads and executes a second-stage payload from the URL http://dogmun.com/ddt/tmp/printf.pdf. The presence of JavaScript actions and streams, along with the use of eval and unescape, strongly suggests a malicious intent to deliver further malware. The extracted JavaScript files, 'javascript_obj111611_000.js' and 'legacy_pdfkit_stage_000.js', are indicative of this payload delivery mechanism.

Heuristics 7

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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://www.pctools.com
- http://dogmun.com/ddt/tmp/printf.pdf
- http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd
- http://www.w3.org/1999/xhtml

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111611_000.js` `772da696bdb365f3f1eb4ea6af881baad391be62f3591b19f2f9827fcc4c9b53`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x7D6	479 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` `bf7895481c7c7347dab468eb08c9bbffab209db5885a72dc1724b3b8f5c6d8ef`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x189	2816 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).

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