PDF malware analysis — malicious · 4d347844b9aa0ab8

MALICIOUS

PDF

11.3 KB

MD5: e42a78db2d7204b555b286005b913150 SHA-1: c3f6b94848351122bd3c2eb765a0eeaf4cd5d559 SHA-256: 4d347844b9aa0ab8892e82dd03bfda501f49c57570a16c4af2dff2b45510ea50

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The critical heuristic CVE_2007_5659 indicates the exploitation of a vulnerability in PDF documents related to the `Collab.collectEmailInfo` function. This exploit leverages obfuscated JavaScript, as evidenced by the `PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER` and `PDF_JS` heuristics, to likely download and execute a secondary payload. The presence of multiple deobfuscated JavaScript files suggests a complex staging process. The ClamAV detection further confirms the malicious nature of the file.

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` `266904abcaa60787c3e8f4680e339b4d5cb4013e63d1a1119103dede821298cb`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	4810 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` `c7e4a3d9f95bca5276cbff2a038311200db7bb1ba8ed80c47157b06c0dd50178`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	11494 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` `017ce87ceb96946ab37a79b896bae6afca5e2e328c393b9f54bd7e1f5dc464fb`	deobfuscated-js	PDF JavaScript deobfuscation pass	73559 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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