PDF malware analysis — malicious · 39273ba6afcfeeaa

MALICIOUS

PDF

9.6 KB

MD5: ab749907ae9a190812fd1fd22a55d23a SHA-1: 5479deae575d196b5b93c7cccf210fb0a89d2da1 SHA-256: 39273ba6afcfeeaa1cdacb3736426cff2f42f9bf13f642a68cb41e43718edc11

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF document contains embedded JavaScript, triggered by the 'collab.collectEmailInfo' function, which is a known vulnerability (CVE-2007-5659). The JavaScript is heavily obfuscated and appears to be a stager designed to download and execute further malicious content. The presence of multiple deobfuscated JavaScript files indicates a complex execution chain. No specific family could be identified, but the attack pattern is consistent with PDF-based malware delivery.

Heuristics 6

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)
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` `dc37160715dd481d0bf49e7af5079aad16ed0e66896c1ae05ca27000b3e4454e`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	259 bytes
`annotation_subject_callee_hex_stage_000.js` `8b125fc04ee33c6946a65680126ee7d3d8438ae67d49d09e6bdf5b05e938525f`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5195 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` `037930d53807797b15be1ec3dbb3d136780bf560aba5c5cd7c7bb96c25d29582`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D4	12357 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` `3bcbc80319a53493b130d9c99abaad9643562b0b8eab38c155229d87785f85fe`	deobfuscated-js	PDF JavaScript deobfuscation pass	45943 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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