PDF malware analysis — malicious · d28c8fe27bc51e45

MALICIOUS

PDF

11.9 KB

MD5: 7c5e3190a169ae7e80e50ce124e93caa SHA-1: dc4a328496dbc3618f1ae0c2cb1317ad19047a90 SHA-256: d28c8fe27bc51e4564b3d0b36fd3a5f9af087d336dd26a055bb543fe65fae8dd

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The file is a PDF containing embedded JavaScript, identified by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The critical CVE_2007_5659 heuristic indicates exploitation of a known vulnerability (Collab.collectEmailInfo) to execute JavaScript. This script is designed to download and execute a second-stage payload, as suggested by the ClamAV detection name 'Pdf.Exploit.Agent-36079' and the presence of large, obfuscated JavaScript streams. The extracted JavaScript streams are too large and complex to fully analyze for specific download URLs or execution commands within this analysis scope, but the overall pattern is consistent with a PDF-based exploit delivering further malware.

Heuristics 6

Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
ClamAV: Pdf.Exploit.Agent-36079 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36079
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. (matched inside decoded stream)
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `ef8bdac794684ae9cd4eb7091d80e1c5ca478c06c639d72d01626c1f7ce78b6d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19C	578 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `23b6c15c5c8b1d7cdf65fdbffa4824c0daa1aef8b2d67854a7b450e268c72c89`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x36F	12301 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `684e63562acb00ff3ae8355fe672f926c5fb2b818ae9888c613e2a3a023be61b`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x36F	5061 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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