PDF malware analysis — malicious · d156d97d2b53b41f

MALICIOUS

PDF

11.7 KB

MD5: e869750b57a2f54abe0200aa83dc8025 SHA-1: 76f16060d631d0eac2b042e2da886875b9f7758d SHA-256: d156d97d2b53b41f56b1d6eca56dab72cc2c4925bce7600cd2953e61d41e1cfa

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF document contains embedded JavaScript, identified as a stager for CVE-2007-5659. This exploit leverages the Collab.collectEmailInfo function to execute arbitrary code. The ClamAV detection 'Pdf.Exploit.Agent-36063' further confirms its malicious nature. The primary attack vector involves exploiting a vulnerability within the PDF reader to initiate the execution of malicious JavaScript.

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` `7abf1679d791d091899c828be7ced6d548a2fbb1ad16a82af1caf7886d59b399`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	4957 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` `bc0d4eff1cc4f7f07bf0d2dc963140348def3e5cd9d99a3e3385262d42da8280`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	11836 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` `eb3e90790092db863a6facd1046290db9f58ae48b9adb857d9d26b1c6e3fe500`	deobfuscated-js	PDF JavaScript deobfuscation pass	72862 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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