PDF malware analysis — malicious · 75ab36c00a3c2eeb

MALICIOUS

PDF

9.4 KB

MD5: 1783aee6305d1d26ba7aeb267edffc02 SHA-1: 046c4be665aa7cc957c99e9ea52cef97431b569a SHA-256: 75ab36c00a3c2eeb9eff9144cbaa79a9c47f46b14d2f04f9f39686dc3c3b8bff

266 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF document contains heavily obfuscated JavaScript, indicated by multiple heuristic firings including PDF_EVAL, PDF_UNESCAPE, and PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER. The critical CVE-2007-5659 heuristic firing confirms the exploitation of a known vulnerability related to the `Collab.collectEmailInfo` JavaScript object within PDF files. The script's primary function appears to be decoding and executing further malicious code, likely a downloader for a second-stage payload. No specific malware family could be confidently identified.

Heuristics 9

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-35912 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35912
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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` `7218a1c68060953321573daa035b16f5f32928ce25a9eb656690dbe78cd9464e`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	201 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`annotation_subject_callee_hex_stage_000.js` `8ae9eeeee6223417c81e70dec29bf532b0ca10bed71075f5051490beb7ed2e9b`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5076 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` `56899e1426bc6be7fa25bbf50fa3502ee8031a5e3e7a882bb919838b0cad3bc1`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2B5	12123 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `9c01162d32fb6d9fc47eb2472ff153dffb27be8b341c0aec64f89e40cef2cace`	deobfuscated-js	PDF JavaScript deobfuscation pass	46646 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

Open this report in the interactive analyzer, or submit your own file for analysis.