PDF malware analysis — malicious · 3f287c082beab9a7

MALICIOUS

PDF

11.8 KB

MD5: d016cb4e7b477a7c3de52b44d9554229 SHA-1: 0650a4a8a307ca2ad9c840f7d14d9548af6afd6a SHA-256: 3f287c082beab9a79bf0bca6deb32b12a0c573c57d30ce2e4e9a7ec50e6b48cd

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1204.002 Malicious File

The PDF file contains embedded JavaScript that is obfuscated and designed to act as a stager. The critical heuristic 'CVE_2007_5659: Collab.collectEmailInfo' indicates the exploitation of a known PDF vulnerability to execute this JavaScript. The script's primary function appears to be downloading and executing a second-stage payload, as suggested by the large size of the deobfuscated JavaScript and the presence of multiple JavaScript streams. The ClamAV detection further confirms its malicious nature.

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` `e9ddc6aa8e826a889234060b9aa302420b20f426635551212f1f01a6d4e394a8`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5006 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` `ed6f7f4e800936f30b79f08437fded48a09c00a6ad6ed0683294943022f6c108`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	11989 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` `1ae5066054a29a8744368e31b3c05abb8f4f003278085611f7083e97df232d99`	deobfuscated-js	PDF JavaScript deobfuscation pass	71659 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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