PDF malware analysis — malicious · c521a9d96ccc5c5d

MALICIOUS

PDF

13.2 KB

MD5: 288db72296c3c86e44ebdcf6b0b1763b SHA-1: 6d5cd47487856662756a1a90e48b31f7994fc042 SHA-256: c521a9d96ccc5c5d328a8a3481c9fb391ecde286b98452c7ef85e3fdd1c44700

194 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information

This PDF file exhibits multiple high-severity heuristic firings related to JavaScript execution and obfuscation, including PDF_EVAL and PDF_UNESCAPE. The ML classifier strongly flags it as malicious. The presence of embedded JavaScript streams, specifically 'javascript_obj0116_000.js' and 'javascript_obj0123_002.js', indicates that the document's primary function is to execute this script. The script's obfuscated nature and the use of eval() suggest it is designed to download and execute a secondary payload, a common technique for initial access.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 8

ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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.
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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_obj0116_000.js` `7690dee696b36ab40a4e71c562563408d5817a9166f6c11894cbbd949f48ddbb`	pdf-javascript-stream	PDF /JS object 116 at offset 0x4BB	47086 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 233 eval/decoder/string-building token(s).
`javascript_obj0123_002.js` `6ca15fa673d28f704937c5ad09dfb1892299da1335558b7088b7fd39e6bbfb80`	pdf-javascript-stream	PDF /JS object 123 at offset 0x386	12646 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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