Malicious PDF — malware analysis report

Static analysis result for SHA-256 953e623cf509fa2b…

MALICIOUS

PDF

97.7 KB Created: 2010-02-23 12:29:53 -08:00 First seen: 2026-05-10
MD5: 25048be224c0c4a41573f46d3193cbb0 SHA-1: 943902bf92702fe12a655936fac11eace0762085 SHA-256: 953e623cf509fa2b11959208e717a7fa4db9635842224dcf345531021d3a1c0e
266 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded files and JavaScript, indicating an attempt to hide or execute malicious code. The 'PDF_IMAGE_LURE' heuristic suggests a phishing or social engineering tactic, where a visual lure is used to trick the user into interacting with the document. The JavaScript action and embedded files are likely used to download and execute a second-stage payload. The benign URLs extracted do not detract from the suspicious nature of the embedded content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 11

  • Adobe Reader LibTIFF XFA image exploit — CVE-2010-0188 critical CVE likely CVE_2010_0188
    PDF contains the CVE-2010-0188 exploit template: XFA JavaScript heap-spray setup, a generated TIFF image payload, and assignment of that TIFF data to an XFA image field rawValue to trigger Adobe Reader's LibTIFF parser.
  • JavaScript action low 2 related findings PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules. (matched inside decoded stream)
  • Adobe Reader JavaScript heap-spray exploit (known CVE family) critical CVE related PDF_JS_KNOWN_CVE_HEAPSPRAY_FAMILY
    PDF JavaScript combines heap-spray staging (NOP-sled / shellcode nybble sled or a multi-kilobyte setTimeOut/setInterval launcher) with the removed Adobe Reader sink getAnnots, associated with CVE-2009-1492. Benign documents never pair heap-spray with these long-removed APIs. The exact malformed argument is assembled at run time, so this attributes the exploit to a known pre-2011 Reader CVE family rather than the exact primitive.
  • 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. (matched inside decoded stream)
  • Flate image XObject contains x86 NOP sled high CVE related PDF_FLATE_IMAGE_NOP_SLED
    PDF embeds a FlateDecode image XObject whose decoded bytes are dominated by x86 NOP instructions, alongside form or embedded-file delivery structures. This is exploit payload staging evidence and is related to Adobe Reader parser-exploit families, but it is not a unique CVE fingerprint by itself.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 2 image(s), only 1 text block(s), carries a click-outward action, and is only 97 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • Suspicious extracted artifact medium 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.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic (matched inside decoded stream)
  • Embedded script payload in PDF stream info PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.w3.org/1999/02/22-rdf-syntax-ns# In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://cgi.adobe.com/special/acrobat/updateReferenced by PDF JavaScript
    • http://www.w3.org/1999/xhtmlReferenced by PDF JavaScript
    • http://www.xfa.org/schema/xfa-data/1.0/Referenced by PDF JavaScript
    • http://ns.adobe.com/xdp/Referenced by PDF JavaScript
    • http://www.xfa.org/schema/xci/1.0/Referenced by PDF JavaScript
    • http://www.xfa.org/schema/xfa-locale-set/2.7/Referenced by PDF JavaScript
    • http://www.xfa.org/schema/xfa-locale-set/2.1/Referenced by PDF JavaScript
    • http://www.xfa.org/schema/xfa-form/2.8/Referenced by PDF JavaScript
    • http://www.xfa.org/schema/xfa-template/2.4/In PDF document text
    • http://ns.adobe.com/xtd/In PDF document text

Extracted artifacts 12

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0002.bin pdf-embedded-file PDF EmbeddedFile object 2 at offset 0x19FA 85 bytes
SHA-256: c06dcd026a7ea0536b63e07ce688691b585339a3ab7ff59065e546b56308c7bb
embedded_file_obj0003.bin pdf-embedded-file PDF EmbeddedFile object 3 at offset 0x1AAC 1466 bytes
SHA-256: 0cae1494b9c99505bf126e683a1a8be36bc8d5e793ab829e266d6e2fd62ccac3
embedded_file_obj0004.bin pdf-embedded-file PDF EmbeddedFile object 4 at offset 0x1D6B 9138 bytes
SHA-256: 8e59e2832942158b30cc943bec6f6d186c8320ff69f268eb68e47b496d07f06d
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 long base64-like blob(s).
embedded_file_obj0005.bin pdf-embedded-file PDF EmbeddedFile object 5 at offset 0x290F 11740 bytes
SHA-256: f47c3dc8c4eeb64abc2cc332be719add15af6ce6dfdcdb477c08a1aefdbe7477
embedded_file_obj0006.bin pdf-embedded-file PDF EmbeddedFile object 6 at offset 0x2AD7 2928 bytes
SHA-256: 226eeacc5eecef2a05ca480f144ff6936594e20b5c7672e8f29f25c8bea65a56
embedded_file_obj0007.bin pdf-embedded-file PDF EmbeddedFile object 7 at offset 0x2E44 200 bytes
SHA-256: 4cb349134bdb5f1a1c03281df9b53128ebe947f235398a912a4f0a9f638b24d5
embedded_file_obj0008.bin pdf-embedded-file PDF EmbeddedFile object 8 at offset 0x2F37 835 bytes
SHA-256: d51b9fc28b592405fb598e711d1495e1421571073bc2e8542d55389768716c06
embedded_file_obj0009.bin pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x3110 291 bytes
SHA-256: e65f1e07bc965092b3153e64a1e8777a909cc47a98c0e2a10d38c47def2e6652
xfa_image_rawvalue_000.tif pdf-xfa-image-tiff XFA image/rawValue TIFF payload near offset 0x29A1 8538 bytes
SHA-256: 671a354149e0ee431b9ab639739547a82c1110f751869622d000c6e04bf7d45f
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis found candidate code region(s). Indicators: NOP sled, heap spray 0x0C
stream_002_off000003e1.js decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3E1 1532 bytes
SHA-256: f574e4d51594d1a8fd22e125b109b827c437aa898edc78babb62dbb93f8744f8
stream_003_off000005cc.js decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5CC 870 bytes
SHA-256: 4a1aca004cf20431c9a66dce85404a6411a54d881a6c257882260ffc972a13eb
stream_008_off0000112a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x112A 3024 bytes
SHA-256: 8358d835225babc82acbcbbf2cb07512b8fb3772c5b46ff5956d2c6d02da8c39

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