PDF malware analysis — malicious · 5e180114521690d5

MALICIOUS

PDF

23.2 KB Created: 2010-07-25 10:32:51 Authoring application: FPDF 1.6

MD5: d8a955a15a5c8d3203c418e52cb2af19 SHA-1: 8fad8f30a9471426f738e1d3fb3e9880c055581c SHA-256: 5e180114521690d56af24ca9fd4cea244ce6acafaee3c21bcb322b4af1257404

156 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 that contains obfuscated JavaScript. The JavaScript utilizes `eval()` and `String.fromCharCode()` which are common indicators of exploit code. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, a common technique for initial execution.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

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.
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.
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_obj0007_000.js` `4945eae8066a09202378e2056a604d6c1bdfc8f2819e97b519e4f473d3a73c06`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1EB	22879 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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