PDF malware analysis — malicious · 074bb918435d20be

MALICIOUS

PDF

97.9 KB Created: 2009-07-28 16:23:15 Authoring application: Scribus 1.3.3.13 (via Scribus PDF Library 1.3.3.13)

MD5: 251ab8a4894895952c534aa59cd7b170 SHA-1: 3f1645a4fc85c9513d9bb501996ad624247bbb1b SHA-256: 074bb918435d20beeee14c2abc3fbd3470d5c3e0df9f379ab952626b6ba024e2

248 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 utilizes the unescape function, indicating malicious intent. Heuristics suggest a relation to CVE-2023-26369, a known vulnerability exploited via active content in PDFs. The ClamAV detection name 'Pdf.Dropper.Agent-7225148-0' further supports its classification as a dropper. The primary function of the embedded JavaScript appears to be downloading and executing a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9987

Heuristics 7

TrueType bitmap font + active content — CVE-2023-26369 related high CVE related PDF_CVE_2023_26369_RELATED

PDF embeds a TrueType font with bitmap tables (EBDT/sbix/CBDT) alongside exploit delivery indicators — CVE-2023-26369 exploits the sfac_GetSbitBitmap function in Adobe's libCoolType for arbitrary code execution. This CVE was actively exploited in the wild, but this rule does not validate the malformed EBLC/EBDT primitive.
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.
ClamAV: Pdf.Dropper.Agent-7225148-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7225148-0
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0029_000.js` `78b7f89807b0cac37538dfb149b2737b4ce9142486594e4c5be2f5231ca39e56`	pdf-javascript-stream	PDF /JS object 29 at offset 0x158EE	52 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0030_001.js` `ef9c4bf6fcf359de8aa354175ed73fe7fd4d2d756e6e1e5c50356977bbcacb53`	pdf-javascript-stream	PDF /JS object 30 at offset 0x15971	43974 bytes

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