PDF malware analysis — malicious · 6b70b13bd9416fb7

MALICIOUS

PDF

25.0 KB Created: 2010-02-09 11:19:09 +01:00 Authoring application: Acrobat PDFMaker 8.1 für Excel (via Acrobat Distiller 8.1.0 (Windows))

MD5: 3367c3d923aef1d1a3fa026ca7b86d6d SHA-1: 83a453b57cfea174ac2db55e6b5cf9b090044b6b SHA-256: 6b70b13bd9416fb7ece1947153cf86aa2e3edc9f69a14531cf98dfe1412358a2

190 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is a PDF file containing obfuscated JavaScript that utilizes `eval()` and `unescape()` functions, indicating an attempt to exploit a client-side vulnerability. The script constructs a large buffer and appends shellcode, likely to download and execute a second-stage payload. The presence of `PDF_JS_EXPLOIT_CLUSTER` heuristics confirms this malicious behavior.

Machine Learning

Nyx PDF Classifier malicious score 0.9275

Heuristics 7

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
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.
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.iec.ch

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0018_000.js` `d51286484dc4aa68744349a6231c4ada0dd44e05be5fa63632930ff38e3e6ad3`	pdf-javascript-stream	PDF /JS object 18 at offset 0x59D	1660 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`icc_00_off0000290c.icc` `00c36ad25cc79152e364edf8e9d58e9fd2807e6188c07a8de84826e22aab9a92`	pdf-icc-profile	PDF ICC profile at offset 0x290C	3144 bytes

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