PDF malware analysis — malicious · 9899b000a70466d3

MALICIOUS

PDF

29.4 KB

MD5: 7cf68f01d934540f09888d482b003583 SHA-1: 0162ec4021e08784962483903b12c76528ab2252 SHA-256: 9899b000a70466d3fc264d03a7a15a82910d0e3a90a947bf3fbaefc0fe8af9c7

202 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

The PDF file contains embedded JavaScript that is obfuscated using String.fromCharCode and ASCII85Decode filters. This script is designed to load and execute an embedded Flash (SWF) file. The ClamAV detection 'Pdf.Exploit.Agent-35955' and the presence of RichMedia (Flash) further indicate exploitation. The embedded SWF file, '20101297.swf', is likely the second-stage payload.

Heuristics 9

ClamAV: Pdf.Exploit.Agent-35955 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35955
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
RichMedia (Flash) high PDF_RICHMEDIA

PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
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. (matched inside decoded stream)
ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85

ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
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
`20101297.swf` `155cb1ff00e6c687a380ad31d1ca035be4d34d8d46179a65e733a7fef7b99805`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x989	53922 bytes
Detection ClamAV: Pdf.Exploit.Agent-35955 Obfuscation or payload: unlikely
`javascript_obj0006_000.js` `87d5b49cd49d28d0af3bc6750b17e2aa546a082553afd5792b19aa54a72d742e`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF6	9280 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 199 eval/decoder/string-building token(s).

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