PDF malware analysis — malicious · 13e45b2ff6a06b91

MALICIOUS

PDF

36.2 KB Created: 2010-02-04 19:00:52 +03:00 Authoring application: formTookYou (via e4f037a7b0481cac2b28293cd99a559f)

MD5: c543031788a0de2514b6a4ed42191125 SHA-1: cdbf4d2f16ae742cc9b8f25bd0c5490fb73e9144 SHA-256: 13e45b2ff6a06b91d226054da434c3a7aad49869b7747ee4b9c93de4abf77b2f

164 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript that is obfuscated and uses eval() to execute malicious code. This JavaScript is designed to download and execute a second-stage payload, as indicated by the PDF_JS_EXPLOIT_CLUSTER and ML_NYX_PDF_MALICIOUS heuristics. The presence of JavaScript streams and exploit indicators strongly suggests a malicious intent to compromise the user's system.

Machine Learning

Nyx PDF Classifier malicious score 0.9979

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)
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.
ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85

ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
Optional Content Group with action trigger low PDF_OPTIONAL_CONTENT

Optional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open
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_obj0018_000.js` `7d8dfbf8d89814510643603dba586deb662b1163457c7c18783fc5337f74834e`	pdf-javascript-stream	PDF /JS object 18 at offset 0x2439	38123 bytes
`javascript_obj0020_001.js` `4a34ffd6f827de9afb9f70fb21aae266a423a1ec56421dd1033ee420963ce256`	pdf-javascript-stream	PDF /JS object 20 at offset 0x8578	1569 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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