PDF malware analysis — malicious · 8cdfa4d1e93375b4

MALICIOUS

PDF

12.1 KB

MD5: e126c597e4e98de30f4712f0915f04ae SHA-1: 16d9b9ea306d47ff4646afe42cf22df2e155297a SHA-256: 8cdfa4d1e93375b47fd72f6bc507e3962641491241c383b19ba3f164187163e1

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, triggered by a vulnerability (CVE-2007-5659) related to the `Collab.collectEmailInfo` function. The analysis indicates this JavaScript acts as a stager, likely downloading and executing a second-stage payload. The ClamAV detection `Pdf.Exploit.Agent-36063` further confirms its malicious nature. The presence of multiple deobfuscated JavaScript files suggests a complex execution chain.

Heuristics 7

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-36063 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36063
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.
syncAnnotScan annotation-staging primitive low PDF_FOXIT_SYNCANNOTSCAN

PDF JavaScript calls syncAnnotScan() — a no-op annotation-enumeration primitive used by exploit-kit JavaScript to stage payload reads from annotation /Subject fields before eval(). Not a vulnerable sink itself; rarely seen in legitimate PDFs. (matched in decompressed 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `eb39e2de4dbbc100de6d3e30aa43ff78fa075618862ba1ebba5151ea3a3b848d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	273 bytes
`annotation_subject_callee_hex_stage_000.js` `3768243ada4b53aed422f7571daf052b3d1cb4dff959040124b416b4e4b34726`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5149 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `13069931c2af8e2d54c5967179016fc36ea8c6d80a919c355e96c68b3d2f0261`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12187 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `84e0e404a5b06af4330ad3bfa0eebbc7d1096417e6887ee4ab67db287a287c0b`	deobfuscated-js	PDF JavaScript deobfuscation pass	74504 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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