PDF malware analysis — malicious · c5b1918bc720dabe

MALICIOUS

PDF

11.6 KB

MD5: 32c970ce80d6113f225b6441d0c6cbe9 SHA-1: 574f23bf33f14834651f12314677a26907744c6b SHA-256: c5b1918bc720dabeae6f52dbfd5e60d62c64c798d824901e76133a9349274087

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript, identified by the PDF_JAVASCRIPT and PDF_JS heuristics. Specifically, the PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER and CVE_2007_5659 heuristics indicate that the document exploits a vulnerability to execute a hex-encoded JavaScript stager. This stager is responsible for downloading and executing a second-stage payload. The obfuscated nature of the script and the use of String.fromCharCode suggest an attempt to evade detection. No specific malware family could be confidently identified.

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)
Annotation subject callee-key hex JavaScript stager high PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER

PDF JavaScript uses syncAnnotScan()/getAnnots() to read an indirect annotation /Subject stream, percent-decodes it through marker replacement, then uses a callee.toString()-derived key to decode and eval the final exploit stage.
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `c860bd3a1b8438b37e98a599719a1868ae540624631f091272ffef48912644f4`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19C	579 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`annotation_subject_callee_hex_stage_000.js` `4f9babaf4fb40280dad82291415ca5552c0be0a1ff7486b03223b655340bd50e`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5110 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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